This review is very cluttered, and so is the story.
I initially thought the "Mob" in the title was referring to something along the lines of a Mafia member, but soon realized my mistake. This anime was alright for being only 12 episodes long, but there are multiple inconsistencies that are hastily patched up last minute in a very rushed manner.
First - The protagonist. Our protagonist is named Leon, he's a dude who's playing this romance game. Isekai stuff happens and TL;DR - He falls down the stairs and dies, awakening as a 10-year-old on a farm (on a floating island or something).
To his dismay, he realizes that he's inside the game he was playing, which is not very good for him as he was ranting about the game being stupid the whole time (Before he made his trip Down D. Stairs).
My main problem with this is that his goal, his ultimate motivation, is very unclear. He spends about a decade in the world as a kid growing up, realizing that this is a world where women are dominant and pretty much have much more authority in comparison to men, which means that they aren't really on equal footing. The main focus of a man is to marry a rich girl and socialize in an elite academy by hosting tea parties and getting to know your future soul mate. One thing you should note about this world though is that is has many base elements such as floating islands, weird mobs that die like they're in a game, and default isekai magic, though there are also things such as mechs. There are deeper elements that are occasionally revealed but don't really add to the immediate story as they seem to be forgotten in the background, not referenced again at all after being revealed.
Leon supposedly decides that he'll follow this goal in order to piss off the bitchy wife his dad has because he knows that he'll be drafted or married to an overweight golddigger instead. Using his previous in-game knowledge, Leon decides to go adventuring to find the most "OP" type of spaceship he used in the cluttered dating sim game in question before he entered this identical world. Remember, this spaceship is OP. After a near-death encounter with a sentient robot inside the spaceship, we learn that there are two types of humans: Ones that weren't related to magic and are dead, and ones that are embued with magic. Leon is apparently a mix of both, which grants him a servant (robot in question) who can operate the entire ship. Unfortunately the magic humans vs normal (they are extict) vs Leon being a mix never comes back into discussion, the only exception being Luxion vowing to kill all the magic humans after he's done serving Leon because that's his purpose.
This robot is named Luxion. Now, Luxion recognizes Leon as his master which means it is very submissive action-wise. This makes sense and isn't bad, as it does act as a monotone companion for Leon, constantly pointing out his flaws but also just asking permission to do actions. While it is present in Leon's life, it's also usually hidden from everyone else at the academy (fast forward: He gets in, big surprise!)
Luxion has access to the ship, which gives Leon a ton of plot armor. However, usually for plot armor you see that they have the plot armor indirectly. "Oh, protagonist survives 100000000 attacks in the span of 3 seconds by tripping? Yeah, that's plot armor." is usually the reaction, but for this, Luxion constantly reminds Leon that he has plot armor.
Leon: "This guy is annoying"
Luxion: "Should I send the entire mothership to obliterate him and the rest of humanity?"
Leon: "No I don't kill haha..."
Anyway, although plot armor is a key trait in Isekai series, this becomes slightly irritating when it's directly rubbed in our faces every so often. This kinda proves that Leon's just like the other girls because it's mentioned earlier that Women are dominent and rule this world in terms of most hierarchy, Leon gaining all this power directly breaks it in the first few episodes.
Next, some more about the world. Things are clearly off about the world, things aren't 100% same as the game. The former protagonist behaves like a background character while another character takes her place delebirately. I'm assuming this other character is supposed to be the antagonist of the story, but their presence is so faint that they only whine about their plans going wrong in the background. You could say that the wannabe antagonist motivates other minor antagonists, but unlike most stories, the minor antagonists have a bigger impact than the main "antagonist". There were several hints dropped that the antagonist wasn't just the new protagonist, she had also been Isekai'd and decided to take the protag's place.
Well, it's not really a giant spoiler because at one point they stop dropping hints and they're just clear with it. Guess what Leon does? Nothing! He questions it very briefly in the first 1 or 2 episodes, but gives up completely and annoys people for the fun of it. Along with this, he has apparently "accepted" that he's a mob character and strives to find a wife at the academy so he doesn't go back home to get married to a gold digger. Using his big brain, he continues to annoy people until he's hated by pretty much everyone BUT the former protagonist, deciding that he'll probably leave the academy anyway.
Okay, so yeah. He's a background character who might leave the academy. He's also noticed someone else took the former protagonist's place but refers to the former protagonist as a former protagonist. Now what? He has a game-breaking op robot servant and ship, free will to do anything, but he chooses to annoy people and cage himself in the "I'm a background character" mindset. Along with annoying people, he also steps out to help the former antagonist (along with the former protagonist) earning him 2 attractive friends, one that has a high title as a noble while the other is a nobody (former protag has that quiet new kid vibe).
The other isekai person/(main??) antagonist seems to be vowing to complete the game by achieving the harem ending, but Leon finds everyone involved in the harem annoying. So he chooses to attack them just because he finds it funny. This does help as it's one of the factors that draws in the high noble friend, but it also uses the minor antagonist's (harem participants) amount of stupidity to further ridicule them in the eyes of the harem chaser (main??) antagonist.
His goal is very unclear but by the second last episode, the character development is a little stunted. Leon is challenged many times by wavering from an overprotective guardian of the timid protagonist to a cold as-stone figure knowing he can't romance them because he's a mob apparently, getting mad at Luxion whenever the robot tells him this and ignoring to face his problems head-on. Luxion even reveals that he's actively preventing any growth and chance on both his social reputation and his relationships with the girls with the way he can't choose.
He faces the consequences of him doing this and instead of trying to apologize or explain, he goes off the deep end and ghosts anyone involved until they literally forget about it. Character development? None, really. Power development? I guess ghosting someone then pretending like nothing happened which indirectly sends them even more deeper into muck results in good results somehow? At this point it's obviously clear that Leon isn't just a side character but he still traps himself in that mindset and resists any urge to properly romance a girl, leading them on even further.
Some positive points though were that the cast was considerably interesting. Minor antagonists that were very egotistical got the chance to reflect on themselves and realize that Leon was leagues above them, even trying to help him. This was great to see, considering even though Leon has been playing them this whole time, they've accepted he's better and are starting to recognize their own flaws. Unfortunately, all of this is thrown away near the end of the story, just right when all of the development happens. "You're my goal, I want to get to your level and I'm starting to see my flaws.. FLAWS? WHAT FLAWS! I'M GOING TO TRY TO KILL YOU YAAAAAAAAA!"
I did like the development for the game's former antagonist, and the side characters were absolutely delighted with how they assisted Leon in you scratch my back I'll scratch your back way, but certain characters such as the game's former protagonist and game's new protagonist arguably stay static. Another thing is that the execution anime-wise is very poor, the scenes that need OST to properly build up events are usually awkward and silent and the animation doesn't always have the audio synced up.
It did sound very cluttered in the beginning and it definitely was, with random plot events happening in a way where it just changes the setting for no particular reason, with each event barely advancing the plot.
I'm forgetting the rest of my points but the last episode felt pretty rushed and tried to do instant character development changes such as people changing their mindsets with little to no actual development leading up to this. I think the "Main?" antagonist will be more present in the 2nd season, though I might check out the manga because I've heard that this just isn't a good adaptation.
This review was definitely cluttered as there's so much to really get into for the story, but... TL;DR - It was a 12 episode anime so it wasn't a massive waste of time, but could definitely use some polishing - Both in writing and anime element execution. It was an interesting general concept, though I'm really hoping that next season contains a more clear purpose. You might find it good and entertaining, but the flaws might be harder to look past depending on what kind of viewer you are.
