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- Title: Kono Naka ni Hitori, Imouto ga Iru!
The story centers around Mikadono Shougo, the son of an industrial magnate named Mikadono Kumagorou who passed away. As a final wish, Kumagorou gave Shougo a condition before Shougo can inherit the family legacy — find a female mate at school. Shougo transfers into a school to fulfill that condition. However, he learns that he has a younger sister who 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.
- Categories: Comedy, Ecchi, Harem, Romance, School Life, Shounen
- Alternate Names: この中に1人、妹がいる！, 三人行必有我妹, 其中一个是妹妹, 其中1个是妹妹, 3人行必有我妹, My Little Sister is Among Them!, NakaImo, Who Is "IMOUTO"?
- Author: Takuchi Hajime
- Artist: Mottsun
- Type: Manga
- Status: Ongoing
- Published: 2011
- Rank: 716
- Total Views: 13117