Isekai Quartet

Okay, let me make this straight. If you want to enjoy & understand Isekai Quartet, you need to watch the 4 animes that are featured in this show first. I really get pissed off when people do not enjoy something but doesn't do the most basic thing first, try to make an effort to understand it before saying such things. There are quite a few jokes that you actually have to be a fan of those 4 anime or you wouldn't understand it. Now with my ranting thrown aside, I'll start the proper review.

Story : 7
The story starts off with a hilarious scene of the ... different Isekais getting forced into another Isekai world, and like any other Isekai, gets trapped in it. In order to try to get back to their original world, they have no choice but to attend school. Which they do a bunch of fun activities and have some hilarious moments between the Isekai characters.

Art : 7
I know this is show uses a Chibi art style, but if I give higher than 7 just because it's cute than every anime can just use a Chibi art style and get high ratings. I will agree the art style is pretty cute, this is the first time I've watched an anime that uses a Chibi art style. It really fits this anime of being light hearted and just made for enjoyment. A drawback of this art is that it can also take some traits away from character. Such as Tanya's menacing personality, Momon's undead glare, Rem's demon looks and Kazuma's lewd stare.

Sound : 7
The OP felt like it was ready to greet me into a world that is filled with enjoyment and comedy. I wasn't mistaken on that part, the show had pretty good comedy, even if they require more understanding. The ending theme was practically non existent, since it is more of a speech, unique.

Character : 8
I feel like I shouldn't really talk about the characters since it's a cross-over, but since it is a cross-ever I feel like I should talk about them. Kazuma and his gang come from KonoSuba, the only Isekai out of the 4 that is more concentrated on comedy. They will be the ones that are more naturally packed with humor. Kazuma being the perverted adventurer. Darkness being a masochist. Aqua being a useless goddess and Megumin being an arch-wizard that only has one move, explosion. Subaru and his squad come from Re:Zero. Subaru always tries his best to make somebody smile, although he goes through a lot during the process. Rem and Emilia are girls who care about their comrades, always making that extra move to bring fun. Beatrice is a quiet loli with an attitude. Momon and his guardians come from Overlord. I can't explain every character since there are too many so I'll just explain Momon. Momon is the overlord that resides in The Great Tomb of Nazarick and has a ruthless personality, being able to kill anything without thinking a second time. Tanya and her battalion hail from Youjo Senki. Again, there are too many people and also many of them are not developed a lot so I will only explain Tanya. Tanya is a little girl that is also a major in the Empire. She despises Being X and takes any chance she can to kill it. Therefore having a sadistic personality.

Enjoyment : 8
I really enjoyed Isekai Quartet, the humor was only point. The characters weren't too off from their original anime where they came from, which was a big relief. I enjoyed the fun times they had together. That also explains that even if they were from other worlds they can co-exist between each another.

Overall : 7
I'd recommend Isekai Quartet to anybody who has watched all 4 anime. If you haven't watched all 4 of them, I highly recommend you do before watching Isekai Quartet. Chances are you will not understand some things in the anime that really require you to watch that specific anime.

Recommended only if you watched the 4 anime.

tl;dr: Isekai Avengers is a good amount of fun, even if it's a little hollow

Isekai Quartet is a crossover between the three best isekai shows and Overlord that takes place in a chibified school setting. It's not a full team up show, as you might see in Western comics, and is instead like the one-off episodes of a sitcom where a few characters from another show visit and make references to their own world. This isn't necessarily a bad thing, just don't go in expecting it.

The worst I can really say about it is that it's less four different isekai casts interacting with each other ... in a school setting, and more four different isekai casts in a school setting, that occasionally interact. There are things you wish they could have done, but the vastly different tones and power levels of each show makes it nigh impossible to do right and really isn't worth the effort in the 9ish minute chibi format.

Will you enjoy it? It depends. If you have seen at least two of the shows (ignoring Tanya's, as they give you a quick overview right at the beginning), you will likely laugh at a number of the gags that reference their respective shows. If not, I'd say skip it and watch Konosuba/Re:Zero/Youjo Senki and/or read the Overlord LN if isekais are your cup of tea.

This is an anime about 4 isekai worlds (Re:Zero, KonoSuba, Overlord & Youjo Senki) bringed to another isekai. It's not really necessary to have seen all of them but if you want a better comprehension just read the argument you're missing.
Nice opening, very energic. Great ending with the most remarkable waifus of each anime. (Emilia, Aqua, Albedo and Tanya).
A nice character development I think, we can know more about the real thoughts of the protagonists of each isekai.
In a nutshell, Isekai Quartet developes a scholar story with the main characters of the animes as students who are not necessarily the best classmates. Very enjoyable.

The best way to enjoy this series is if you have watched all four, if not why the fuck are you reading the reviews you've got some amazing shows to watch. But if you have great, this show is basically what if people that went to another world, went to another world. To be honest I think its nice, like from the 4 anime's they chose konosuba is the only "positive" one whereas the others are darker. So this gives us a nice pull away from those seasons. Also some of those series are still awaiting their second season such as Saga of Tanya and ... Re:zero, which I enjoyed. So this gives me reassurance that there will be another season lol.

I think the main reason why this is so enjoyable is to see the characters interact with each other, which we wouldn't be able to see. And when they bring up references from their animes that gives it all the more joy.

Basically, if you have suicidal thoughts, depression, anxiety or anything else that causes you emotional suffering and you have seen Saga of Tanya the Evil, Overlord 1, 2 and 3, Konosuba season 1 and 2 ANNNNDDDD Re:zero, then this is the cure to all your problems. Thank me later.

Four people sent to another world push a BIG RED BUTTON and get sent to ANOTHER world, this time, instead of saving or conquering that world, they have to live in it as highschoolers alongside their eccentric friends who become Isekai protaganists themselves in that moment.
With a premise like that, you know it'll be good; and it doesn't disappoint!
Isekai Quartet is one of the best comedies I have Ever seen in my life, everything about it is perfect
I find the art very cute, It's just like the RE:Zero shorts (Probably was the inspiration for the crossover) I love the fact that all the scary demons ... in Ainz's group are all turned into adorable chibis.
All the songs are also very funny and full of references to the original shows. I especially love the Opening song "Isekai Quartet", I never knew that Ainz could sing so well; he's the last person I expected, and I loved it. I also love the Ending song "Isekai Girls Talk" Those four could probably be a good Idol unit in this world (Though I doubt that Idol is the dream job of Albedo and Tanya, Aqua and Emilia might be more into it).
Speaking of the characters, they are all preserved from their original shows, very few changes were made and that's part of the fun; Having all these people pulled from different worlds with Completely different Ideals, My favorite so far was Kazuma thinking that Subaru had it so easy because he's rich (oh Kazuma, if you only knew the horrors poor Subaru has faced, actually, maybe you shouldn't.)
I also like how we get to see other sides of the characters that we suspected they had but couldn't show because of their position or status( I knew that Tanya wasn't as Heartless as she appears to be at first, but I think this might be the first time she had a friendly conversation with someone outside her squad (In this case, Ainz).
Overall this show is really fun and REALLY funny, My only complaint is that this show requires you to have seen the original four shows to get several of the jokes and references, (Megumin and Emilia share the same seiyuu) But overall, this show is very funny and a must watch to any Isekai fan.
Hopefully if it's successful enough, we can get a new series of EVEN MORE Isekai shows; We could throw in some mecha shows like Escaflown, Dunbine, Rayearth and Watau, some older shows like Inuyasha and Digimon coupled with some newer shows like Slime Hero, Shield Hero, No Game No Life and many others so we can have a Multiverse spanning adventure!
ISEKAI CINIMATIC UNIVERSE, LET'S GO!!!!

So if u didn't watch that 4 Isekai anime[ Re:zero,Overlord.Youjo Senki,Konosuba] before u will can't enjoy This crossover event 4 Isekai anime. ---Overall this crossover was Good and can make u enjoy this show.
Story:: 8
Soo it about they have just send to different alternative world and do something together that all (Isekai going to Isekai) who care about it? this is just a fanservice crossover for isekai fan.
Art:: 7
They make character be like Chibi like before this Studio do. So you can see this Art before from Re:zero special EP.
Sound:: 9
Nice OP,ED and use same voice actors. that all we want.
Character:: 7
Like I ... said before. Character be Chibi so if who care about it they will feel hate but that not enough to not love this show.
Enjoyment:: 8
I was enjoy this show. Commedy that can heal me very nicce.
Overall:: 8
So u can give a nice Score and enjoy the show if u have watch all 4 isekai anime.
This is not bad crossover They didn't leave supporting characters... supporting character still have they role from them story u can remember them no matter what how long when u watch this 4 isekai anime.

I'm watching this because I'm starving for Konosuba...and it's going to be my fix until the movie comes out.

Story: It's in a school. It's mini-episodic. All events are high school oriented and absolutely unoriginal. 1/10.
Well they use the characters in their proper roles I'm guessing, so 2/10. Still so lazy the effort is non-existent.

Art: The chibi works fairly well. Animation is very minimal and lazy too, but hey, as long as it works when it has to (I could watch Aqua being punched by Kazuma probably 10 times in a row)...7/10

Sound: Talented VAs from good shows, and a cute opening. It's overall very solid. 8/10

Character: ... Well as expected, it's always brutally dumbed down for these crossovers. If Persona Q failed at not dumbing down everyone, then I had, rightfully, no hope for Isekai Quartet, and well it brings down the characters almost to their most basic tropes. They did Tanya and Ainz fairly well IMO. I haven't seen Re:Zero, so I don't know about Subaru. And as for the Konosuba team, troping them isn't really a mistake since they are giant tropes anyway.

It's dumbed down, but it could've been worse, is what I mean. Still, 4/10, no miracle.

Enjoyment: 7/10 I thoroughly enjoy every time the Konosuba crew does something Konosuba, and even though I think Overlord is mostly underused, Tanya is pretty good. The relationships are written well enough to be credible and the jokes are far from bad.

Overall: 5/10: No miracle anywhere here. It's another dumbed down, low-animation, no-plot no ambition cash grab. But for a fix of your favorite Isekai characters, it'll give you your fix.

Are you a fan of isekai? Maybe you like Re:Zero, or Tanya the Evil? Perhaps you remembered how funny Konosuba could be, and thought a comedy show with some of the same characters could be funny?

If so, stay far away. This show is bad.

I won't say that it doesn't have any redeeming qualities. The cast of Konosuba is still amusing to watch, albeit much less so than in their own show. And if you're a fan of Re:Zero, there are a few scenes sprinkled here and there that you might like. The vocalists for each respective show give comparable performances to their original ... series, which is quite solid for the most part. There were even three or four jokes that actually utilized comparisons between the four different series that had some degree of comedic value!

But personally, a handful of decent scenes(most of which were done MUCH better in their respective anime) are not enough to justify two hours of staring at low budget chibi characters being move-tooled across the screen with the occasional magic circle in the background.

As for the isekais chosen, I have absolutely no idea why anyone thought it would be a good idea to include Tanya in this. Overlord was also a terrible choice because half of its characters are obnoxious and the other half are bland, but at least its setting is similar enough to Konosuba and Re:Zero that I can understand it's inclusion.

I want to make my thoughts clear, so I'll repeat myself: the ONLY thing this show really has going for it is that it happened to involve characters from shows that are actually good, and one of those shows happened to be a great comedy. That is the sole reason my rating for this series is a 4, as opposed to a 2.

The main takeaway I got from the first season was a question: what were they thinking?

(Light Spoilers)

This anime is definitely one of the best animes I have seen in quite a while. The Isekai genre is generally hated because of how oversaturated it is with shitty cliche animes so I can understand your hesitation to watch this because of the premise. The isekai picking decisions in this anime were impeccable though. They picked out the four BEST isekais of all time (Rezero, Youjo Senki, Overlord, and Konosuba) and isekai'd them all into an isekai. Each short but awesome episode is always goofy and shows them doing various random activities that are incredibly amusing to watch. If you've seen all 4 ... of the isekais featured in this, you can understand all of the references they pack into there (theres a ton obviously) and it makes it that much more enjoyable. Personally after not seeing any new content for Rezero, Youjo Senki, and Konosuba for the past few years this was a beautiful breath of fresh air that I and many others needed. Each character has their official voice actor, the op and ed are mindblowingly amazing, the story is hilarious and incredibly relaxing to watch, and is overall an amazing anime that I adore. Although the art is very basic and chibi-like, it doesn't take away from the enjoyment whatsoever and I personally think it adds to it. I definitely recommend this anime IF AND ONLY IF you have watched ATLEAST 3 of the 4 isekais featured in this anime. If you don't then it is completely useless to watch. Sorry for the lengthy review and thank you for reading!

So I 'm going to Echo a lot of people here. If you haven't watched (and enjoyed) the following shows:
Konosuba
Overlord
The Saga of Tanya the Evil
Re: Zero
Stop! Do not pass go! Do not collect $200.
If you didn't watch and/or enjoy the above shows, yes this is not the show for you sorry but you're just not going to get it. Isekai Quartet is appealing to an extremely niche audience and it knows it but for what it is (and my drunken ass watching it a 2 in the morning) it's freaking great. The charters stay so true to their nature and holy shit ... I can't not watch the next episode, keep them coming I'm loving it!

What happens if you take the maincast of 4 anime, give them a funny side-series with a slice-of-life kinda feel, with 12 episodes length 12 mintes each (including into and outro)?
The answer is: not much.

Unfortunately I wanted to give this a higher rating, because honestly: The characters have nice interactions, are well written, are as charming as they are in their respective anime with their unique quirks - so to speak.
It definitely is entertaining and if you like the characters, you will get a bit more of them and see how they act off of each other. However, it's really just "a abit", which ends ... up pulling my enjoyment down. Like, I would love to see more of it - but as there isn't, it just leaves me with a unfullfilling feeling.

Just look at the picture for it: You already have 4 maincharacters, 4 main supports, add 2-4 other supporting characters each, add a few more for teachers and then give it the average length of half a normal anime. You don't need math to figure out, that this adds up to barly any screentime for most of them. As a result most of them have less spoken sentences than there are episodes.

With that in mind, there is simply barely enough room for characters to interact with eachother, let alone build any kind of relationship or having some kind of arc or developement. Frankly such a side-show doesn't need a character arc - but when for example one characters announces a rivalry with another character early on, I'd like to know this acutally means anything. But given the setup, there is a chance they won't even have any direct interaction before the anime ends. It's more like "Remember that? - The Anime". Remember how Ainz knows powerfull magic? Remember how Tanya is sadistic? Remember how X is lazy, Y in love, Z is loyal? Interaction usually touch the "How would those to react to eachother", but as stated before, doesn't have time to go anywhere with this.
The few times characters are actually interacting, it feels like a great setup for further developement. You see two characters talking about a topic and think "Wow, I didn't expect them to get along so well, I wonder where this will be going", but it doesn't, because you got over a dozen other characters fighting for screentime.

This could be a proof of concept. Having a crossover of several good and beloved anime can be really entertaining. I even have to admit I liked some of the characters more in this one, than I did in their own anime. Which makes it even more disheartening, to know the show is ending before anything happened.

So far, this has proceeded my expectations by a mile. There seems to be an actual story, the characters are very entertaining, and the OP and ED are great.

The Show basically consists of four shows; RE:Zero, Konosuba, Overlord, and Youjo Senki. The main characters from each show ended up getting isekaie'd into this school because of buttons that magically appeared. At this point, no one seems to know what is going on, but there seems to be a full story. There are individual traits that you see in each show that the creators put in this crossover, such as Aqua being completely useless, or ... Albedo being a fangirl over Ains.

As of now, I would highly recommend this to everyone. My enjoyment factor was at least a 10/√100

To be honest, this is one of the most surprising thing I've watched this year. On paper, Isekai Quartet sounds like a joke but I did laugh my ass off, hand down funniest thing this year for me.

I won't state the obvious like every review you've read. As a viewer who watched all these show, it's so amusing and happy to see them interact with each other. It's the biggest strenghth of this anime, it excels in humour department. While I can't say the same about the animation or the artstyle, it's not a problem. The chibi style only helps more.

Along with catchy ost, I ... think if you're a fan of one or all these animes, this show should be on your ptw list.

Honestly, there is not much to say about Isekia Quartet. Its a crossover of 4 popular isekia shows at a typical Japanese high school with everything down in the chibi art style. There are some enjoyable jokes, but it nothing earthshaking. If one has watched at least 2 or more series featured here, then there is some enjoyment to be found.

Isekai quartet is a crossover show of Re Zero, Overlord, Saga of Tanya the Evil, and Konosuba. They all are magically transported to a Japanese high school and hijinks ensue. They are jokes and barbs thrown between these characters, and they go through ... all the high school anime cliches. I enjoyed it reasonably well. The episodes are short too about 10 minutes each.

If you have watched 2 or more of the listed shows, you might enjoy this. For me, this was fine, but if this were never made, I would not think I would have lost out.

If nothing else, I appreciate the sheer cynical genius behind Isekai Quartet. Isekai is the most popular genre in anime right now, Kadokawa owns the rights to some of its most popular entries, so what’s the quickest ticket to printing all the money imaginable? Have them all cross over in a silly gag spin-off,using the combined star power of all these successful casts to rake in fans from across the anime spectrum, encouraging fans of one show to check out the others ones in the process, while banking on the relative quality of all the shows in question to make for an enjoyable experience on ... its own merits. That’s on par with the MCU when it comes to Galaxy Brain brand-IP management. And for what it’s worth, I give it all the credit in the world for achieving exactly what it set out to do. Isekai Quartet tosses the casts of Re:Zero, Konosuba, Overlord, and Youjo Senki together into a high school slice-of-life comedy short, transporting them from their own individual parallel worlds to yet another parallel world that requires them to follow classroom etiquette and generally get along with each other. The stage is set for wacky hijinks, in-jokey references, and conversations between all your favorite characters, all while the series itself begins establishing its own mildly intriguing internal lore as to why all these disparate worlds came crashing together in the first place.

The obvious appeal of a show like this is going to be in how well it can capture the spirit of the shows it crosses over. And what ultimately makes Isekai Quartet a worthwhile time, despite some flaws that I’ll get to in a second, is that it excels at this task. You never doubt for a second that the characters you see traipsing around the classroom are the same lovable idiots you’ve seen in their own shows countless times before. The writing does a fantastic job capturing the feel of every cast’s respective chemistry, to the point where I wonder if the original scriptwriters were working on the dialogue. And with the communal classroom setting, there’s a lot of fun to be had in seeing how everyone’s archetypes play into classic high school student archetypes. Konosuba’s cast are the stoner losers, blabbering their thoughts in a stream of unhinged improv-adjacent consciousness, courtesy of the fantastic seiyuu performances. Re:Zero’s gang are the jocks of the group, confidently taking charge with tightly written, intricately interwoven quips flying between them a mile a minute. Youjo Senki’s battalion are the preps who handle every situation with dorky seriousness, trying to keep a straight, formal face in the midst of all this madness. And Overlord’s people are... hm... I dunno, the utterly obnoxious LARPers who get way too into their roles and everyone’s too polite to tell them to stop? Look, Overlord fucking sucks, so if nothing else, Isekai Quartet properly represents how mealy, pasteboard and stiff that show is.

Which brings me to the first big issue: your enjoyment of Isekai Quartet will depend heavily on how much you like the individual shows. If you’re not invested in at least half of the properties I mentioned, you’re probably better off staying away. For my personal tastes, obviously, any time the cast of Overlord took center stage was an exercise in sighing heavily and waiting for it to get back to the characters I actually liked. But I also find it weird that Saga of Tanya the Evil was one of the properties chosen to cross over. I mean, that show is now known for its ensemble cast like the rest of the quarter here; Tanya and Viktoria are pretty much the only memorable characters. And none of the completely interchangeable soldiers who transport over with them leave any sort of impression here either, which just begs the question of why Kadokawa didn’t choose another popular isekai with a stronger character dynamic to take its place. I mean, Tanya’s story is all about plot and big ideas, it’s not well-suited to this kind of gag spin-off. Thankfully, Tanya herself remains a fantastic character here, so it’s not a total wash, and the remaining two properties are still as solid as ever. I think re-uniting with the Konosuba cast after so long really made me appreciate how much their seiyuus add to these roles; their voices are all so cackle-inducingly elastic, able to snap like a rubber band between low-key snark and utter batshit lunacy at the drop of a hat. And, of course, there’s Re:Zero, my favorite isekai of all time in no small part thanks to its wonderful ensemble dynamic, and I’m pleased to say it hasn’t lost an ounce of its charm. Any more time spent watching Ram’s incredible deadpan act is music to my ears.

But up until now, I’ve mainly been talking about the shows as separate entities. This is a crossover, isn’t it? What about the fun of watching them all clash and collide and fulfill every fanfiction author’s wet dream of seeing how X would interact with Y? Well, that’s where my real enduring problem with Isekai Quartet lies; it does not take good advantage of its premise. For a crossover show, we spend far too much time with each cast isolated in their own little community, rehashing and reheating the comedy dynamic of their own universe without expanding it to include everyone else’s influence. The appeal of this show should be seeing how people from different worlds would interact, but I don’t think even half of the show’s runtime is allotted to conversations between the four different properties. Sure, they’re all hanging out in the same classroom, but they’re mostly bouncing off Re:Zero’s Roswaal as their campy, sadistic teacher, with very little time to actually talk to each other. The bits we do get are great; Kazuma and Subaru’s meet-cute in episode 4 is everything you could possibly want it to be. And Aqua’s eternal rage boner for Ainz’ undead presence is probably the funniest joke anyone’s ever told with that character. Hell, I’ll even say that Ainz is able to show some genuine pathos and nuance in his conversation with Tanya, where he finally gets to act as himself instead of an all-imposing skeletal demigod. These bits and pieces do everything you would want from a crossover like this, bringing out everyone’s best qualities and making something even more entertaining in their collision. So why does this show feel so averse to actually letting that happen?

Maybe part of the problem is how big the casts are; I feel like it was a mistake to transport so many characters from each show over, as with so little time to spread around so many people, everyone outside of the leads from each show ends up feeling pretty shortchanged. And it doesn’t help that since Overlord has the biggest cast, they end up getting a lot of time in the spotlight, and, well, like I said above, Overlord fucking sucks, so that ends up being a drain on things (plot twist, this review is just my excuse to shit on Overlord some more). My solution? Limit the scope: have no more than four characters from every show. Obviously, the village idiots from Konosuba are fine as is. Re:Zero’s motley crew would work with just Subaru, Emilia and the demon sisters; Ram’s snark kinda removes the need for Beatrice to be there if she’s not an integral story element as well. Youjo Senki can pair itself down to Tanya, Viktoria, that one mullet guy whose name I forget, and one more soldier. And Overlord... eh, I’d say Ainz, Albedo, Shalltear and Demiurge, they’re the most important characters in the show, so they’d be the best option, and it’s not like the rest of the Tomb of Nazarick is any more interesting. Point is, with that decreased scope, I think the show would allow itself a lot more freedom to find consistently fun and interesting things to do with the characters it allowed itself. Because come on, guys, how can you have Megumin and Emilia in the same show and never have them interact? You’ve got two iconic roles by one of the best up-and-coming anime actresses, and you don’t make a point of showing off her talents by making her play them off each other? It’s like they tried to make this the least interesting version of itself they possibly could.

Still, for all my gripes and frustrations, I can’t deny that I still had a lot of fun with Isekai Quartet. Maybe it’s cheap, maybe it’s base, maybe I’m just a cog in a marketing machine, but you know what? Sometimes, it’s okay just to hang out with all your favorite fictional friends and not expect much more than a good time well told. This ain’t no masterpiece here, and I hope the inevitable second season finds more time to spend on the inter-cast dynamics, but I still had fun catching up with old friends and reminding myself why I fell in love with them in the first place. And now, the speculation begins on which new franchise(s) is/are being added in for the second season. Anyone know what other big isekai properties Kadokawa owns? Because I’ve got a sinking feeling that I might need to actually watch Shield Hero to prepare for season. God help us all.

I do NOT recommend this for anybody not familiar with the 4 series that make up this fan-service show.

Instead, it is recommended for those who have previously seen the Isekai animes involved.

Isekai Quartet is a very short anime show that through very little reasons and with very little story, drags and pairs together 4 popular animes in the Isekai genre.

Although the story is nothing amazing and subpar at best, Isekai Quartet brings interesting interactions among the characters in a lovely chibi style that is very polished. They got together all the original voice actors and with the silly and non-important setting on mind, the overall ... enjoyment you can get out of it depends purely on the viewer's expectations.

I give this a rating of 7 based that they kept the characters true to themselves, added meaningful interactions between the Isekais, had a enjoyable art style, a subpar story and sound.

Again, would not recommend especially if you did not enjoy the participant's original animes.

Isekai Quartet takes four worlds of the Isekai genre and puts them all into one world. This crossover of various characters provides excellent entertainment, and provides answers for what would happen if one character met a character who, for example, despises the other.
I'm not really sure if there's a story, but every episode has a selection of characters performing a certain task. For example, one of the episodes is a test of magic, which allows for the characters to showcase their magic, allowing the rest of the cast to learn and adapt to each other.
The art style is cute. It makes sense why they chose ... this Chibi style of art, since it would be strange if a giant skeleton was realistic, while you have this skinny tracksuit kid just being stared down at him.
The music is amazing, since it brings in tracks from each series into it, alongside the opening song to be sung by the four main characters of their series (Kazuma, Subaru, Ainz, Tanya). They're voices match well with each other.
Like I said earlier, the characters come from different worlds. It's amazingly funny to see Aqua try to eliminate Ainz just because of his appearance, only for Kazuma to intervene and punch Aqua. Or, my personal favorite, when Kazuma calls Subaru a harem-bastard, since Kazuma claims "Subaru had it easy".
The show is SO enjoyable. The episodes are short, yes, but you can put on any random episode, show it to someone, and they'll be like "Heh, this is good!"
Overall, it's amazing. My only problem is that the episodes are insanely short, being 12 minutes each. But, besides that..there isn't really much to say. It's great, and I highly recommend it. You don't really need to watch the series the characters are from, which makes it an easy joyride!

I'm gonna be honest. I went in fully expecting this to be a fan fiction of some of the greatest isekais and came out gleeful.

I loved the the charm of them running around in their chibi artstyle that kadokawa generally uses for their spinoff comedy shorts.

The character interactions?
Fun as hell and generally had me wishing for who could possibly be in next season. I wanted Tanya and Ainz to talk to each other often and maybe play with their dynamic of their past lives or the villains from the over series to come over as a villain before being curb-stomped aside or something.
But overall, ... it made me smile when two characters had their share of comradery,

Sound was fine.
I didn't bleed and it's not writing home any GrammyAwards but some of the songs were great. The OP and the ending had me hooked for a great deal, often having me sing it under my breath. And the VAs generally sounded like they were having some fun with it as well.

The story.
The story is ok. It's a high school setting with isekai characters that have been isekai-ed into a new world. There's little thrill in there and since the majority of the series is located at the school, you see little of what's outside as there could be anyone out there. More isekai characters from different schools to represent different publishers, affects that spells have on citizens or anything to compare worlds with other than power scaling.
But it's a spinoff so story is just sidecontent.

I feel like I enjoyed it but I'm being blindsided by my own biases.
So I felt like a 7 was best overall.

I think most people would be able to enjoy this with only having watched one of two the shows in it. Even though the only Isekai that I've seen so far has been Re: Zero, I still found this really fun and entertaining. I get the general gist of Konosuba, and the characters from the other two shows aren't hard to understand in this context. I'm sure that there were a lot of subtle jokes that would've only made sense if you had seen all four of the shows, but for what it was worth I found it to be pretty funny. The animation is ... pretty basic, but the chibi designs for all the characters are pretty cute. The ED is pretty good as well. On the whole, this was a good show just to put on when I wanted something basic to watch.

Wow. I just finished Episode 7 as of writing this review- and let me say, the music is AMAZING!! The 'Girls Talk' (ending song) is so well done and I actually listen to it sometimes when I'm bored and have nothing to do. Love all of their voices and the voice acting is done pretty well.

The chibi art style was so adorable and I loved the cast of Re:Zero's designs! They were so cute in the art style of the anime.

I haven't seen any of the animes featured in this collaboration... but I do know a little bit about each of the characters. I ... know for certain that if you are not like me, and have seen all of these animes, then I'm sure you will enjoy this collaboration!