Original title
この中に１人、妹がいる！
Released
7/6/2012
Origin country
JP
Genre
Animation, Comedy, Drama
Production companies
Studio Gokumi
Status
Ended
Number of seasons
1
Number of episodes
12
Is insanity hereditary? Shougo Mikadono's beginning to think so, because the terms of his late father's will seem crazy and following them may drive Shougo bonkers as well. Oh, it sounds simple at first: before Shougo can claim his VERY large inheritance, he just has to start attending a certain new school and find a nice girl to marry. It's a little unromantic, but perfectly do-able, right? After all, all the girls seem quite friendly, so all Shougo has to do is find one he has something in common with. Except, and here's the kicker, it turns out that Shougo has WAY too much in common with one of them, because she's actually his long-lost sister! And he has no idea which one she is! Will Shougo meet and court his Miss Right without committing something very morally wrong? Can he find his future bride without slipping into the wrong set of genes? And if his little sister does reveal herself, just how much will be revealed and under what circumstances?
Shogo Mikadono is the son of an industrial magnate named Kumagoro Mikadono who passed away. As a final wish, Kumagoro imposed a condition Shogo must meet before he can inherit the family legacy—find a female mate at school. Shogo transfers into a school to fulfill that condition. However, he learns that he has a younger sister from whom he was separated at birth. He does not know what his long-lost sister looks like, but she happens to be one of the students at his new school.
During his father’s funeral, Shogo hears a voice outside his window claiming to be his little sister, before he has a chance to learn more, he is told the conditions of his inheritance.
After the mysterious phone call the person claiming to be his sister, Shogo school life gets more hectic with the arrival of a new transfer student.
The question of Shogo's sexual preference is causing Miyabi and Rinka to go overboard on showing the appeals of a woman.
Shogo has ruined his relationship with Miyabi; after letting Konoe know about his secret, a new problem has arisen.
He thought it was over but his little sister keeps calling. Shogo discovers someone else has the same prototype phone as Konoe.
Lyrical Sisters is on the verge of shutting down, Shogo puts together and executes a plan worthy of the Mikadono name.
Using the school broadcast system, Shogo’s “sister”, has requested he stops looking for her or she will reveal damaging secrets.
Kunitachi might be the Shogo’s sister but he can’t get close to her. Ikusu suggest that Shogo and Kunitachi spend time outside the school to have her drop her guard.
Shogo is getting a new neighbor and an unexpected surprise.
When all of Shogo’s potential wives are invited to the same party, things do not go as planned. Especially when he finds a trusted member is planning to overthrow his inheritance of the company
With all the lies, conflicting stories, and people trying to ruin his inheritance, Shogo is breaking down. To add to his worries, Kannagi is making outrageous demands.
With the help of Ikusu, Shogo has finally put the clues together on who his real sister is.
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