Mikadono Shougo, the son of an industrial magnate, has until the end of high school to find a girl he loves for marriage because of his late father's last will. For that, he transfers into Miryuuin Academy. Among the students there is a girl who says that she is Shougo's separated-at-birth sister, but she does not inform him of her identity. She and some other girls then try to get close to him. Source: Baka-Tsuki
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