Mamahaha no Tsurego ga Motokano datta

Listless geek Mizuto Irido and introverted nerd Yume Ayai seemed like a match made in heaven, connected by their mutual love for literature. Unfortunately, their differences gradually grew, and they separated just after their middle school graduation. But, as if by divine comedy, the two find themselves reunited as step-siblings.

A rivalry begins to brew between the former couple, both unwilling to acknowledge the other as the older sibling. In an attempt to "solve" this issue, Mizuto and Yume agree upon a rule: whoever crosses the boundaries of siblinghood norms loses, and the winner will not only be called the older sibling, but also get to make a request. However, now that they live under the same roof, the lingering memories they share start to influence their actions—possibly rekindling the feelings that may not have been fully extinguished in the first place.

[Written by MAL Rewrite]

Irido, Yume Main

Hidaka, Rina Japanese

Irido, Mizuto Main

Shimono, Hiro Japanese

Higashira, Isana Supporting

Tomita, Miyu Japanese

Minami, Akatsuki Supporting

Hasegawa, Ikumi Japanese

Kawanami, Kogure Supporting

Okamoto, Nobuhiko Japanese

Tanesato, Madoka Supporting

Hikasa, Youko Japanese

Irido, Yuni Supporting

Kayano, Ai Japanese

Tanesato, Chikuma Supporting

Satou, Hinata Japanese

Homeroom Teacher Supporting

Nakamura, Genta Japanese

Madoka's Father Supporting

Shinomiya, Gou Japanese

Iizuka, Aya Producer

Sotokawa, Akihiro Producer

Ozawa, Fumihiro Producer

Oomori, Shinji Producer

Reviews

Jun 1, 2025

elite_aiyaan

Recommended

This anime should have an award for such a deceptive title. I mean it is accurate, but most people reading the title would get the impression that it's just another horndog Ecchi anime. But it's not. I mean there are moments that some ecchi things happen, but they're mostly comedic. But honestly it's more than that, it has that ample amount of awkward romance and wholesomeness that it just works. I don't think it's something really deep or whatnot, it's got a few cliches. But the thing about cliches is, they exist because they work. While normally it'd feel corny to even me, somehow this ... thing in this particular story works for me. I love it. Also can't forget about the characters, so relatable to me as an avid book reader. Specially my man Mizuto, when he says, "The world of fiction was real to me, and the reality just felt like fabrication." STRAIGHT UP BARS. Now I know most people will find this thing corny, but it's just a me thing.

Reviewer’s Rating: 7

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Jun 8, 2025

Neonblade1

Mixed Feelings

6/10- Could have been really good but it isn't.

It does have an interesting premise but disappointingly the direction it takes is generic and mediocre.

The two main characters are exes- Yume and Irido. Until recently, they were in a relationship but they break up due to several reasons. Now, they find out that their parents are marrying and they are now step siblings. The premise has a lot of potential with good writing and decent scenarios.

Their backstory and reasons for breakup are well written but the story doesn't explore its implications and impact on their personalities well. Its stated very openly that they ... still love each other and will be with each other if not for their issues.

Unfortunately, the plot doesn't do much with this. Its enough for a standard romcom, but not enough for a good one.

As far as chaaracters, sometimes it does seem like that our male main character might be better off with one of other love interests. Which is one of the big negatives of this show.

TLDR- 6/10. People who like romcoms might enjoy this, but overall this show is skippable.

Reviewer’s Rating: 6

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Apr 17, 2024

LegionIscariot

Not Recommended

Starts off pretty good.
Irido and Yume are exes. However one day they find out that their single parents are getting married to each other.
So now Irido and Yume are stepsiblings living in the same house.

Irido is the emotionless one, he loves reading books, keeps to himself, and doesnt stress about most things. A really great character.
Yume is a former nerd aiming to reinvent herself as the class princess.
The two have a love hate relationship but must try to be on their best behavior to keep their parents happy. But at the same time trying to control the fact that the feelings they ... had for each other is resurfacing.

Like i said it starts off pretty strong. But then devolves into boring, dragged-out garbage.
Mainly because Yume is such an unlikeable character (◔_◔) And the second half of the season focuses so much on her.
She doesnt make a good tsundere. She is written so annoyingly. Always shoving her nose in her ex's/stepbrothers business. And is also a giant c*ckblock. And very possessive.

The other female characters are also a little "crazy" in their own way but atleast they are entertaining. Not like this killjoy who acts like her life sucks when it really doesnt.
She's constantly monologuing in her head about her childhood, and its so tiresome to watch over and over again.
Another thing that drags on for too long is the whole shyness thing. Its so tiresome seeing these shy girls take forever to complete a sentence.

There are other characters like Minami who asks Irido to marry her so she could get close to Yume. A good plot that gets tossed aside way too quickly. Because at this point Minami is a very fun character. But after that plot Minami becomes almost as unlikeable as Yume.

Isana is the best character. And should have been the main character. She has big breasts and is kinda tomboyish. She is very close friends with Irido, and they have a buddy relationship. The interaction between the two is the highlight of the show. Seriously every time these two are together and are just being comfortable with each other it is the best thing ever.

Meanwhile you have Yume and Minami trying to push Isana into a romantic relationship with Irido, even though Isana prefers her current friendship with Irido just as it is.
This is when Yume and Minami are at their most annoying. Trying to play matchmakers. Trying to turn Isana into something she is not.

But Yume is the one you're supposed to be rooting for... You are supposed to be rooting for Irido and Yume to get together. The problem is the other girls would make much better girlfriends for him.
Sometimes the anime isnt sure who is supposed to be the love interest.

Typically in a romance the viewer should want the two main characters to end up together ¯\_(ツ)_/¯
Here im rooting for them not to be together. Thats not a good sign.

Reviewer’s Rating: 5

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