Nakaimo, My Little Sister Is Among Them! (Complete Collection)

Sh?go Mikadono is the son of an industrial magnate named Kumagor? Mikadono who passed away. As a final wish, Kumagor? imposed a condition Sh?go must meet before he can inherit the family legacy—find a female mate at school. Sh?go 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.