Kono Naka ni Hotori, Imouto ga Iru! この中に1人、妹がいる!

Mikadono Shougo, son to a rich and powerful company chairman, has to attend school to find a girl he is serious on before he can inherit the company. On his father’s funeral, a mysterious girl claiming to be his sister says she has come to marry him before disappearing. When he attends his new school, he finds out that his sister might be amongst the girls around him. How will he choose when he is not sure who is his sister?

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