• Book Name: Osananajimi No Ijou Kawaii Imouto-Chan Manga
• Alternative(s): 幼馴染の異常可愛い妹ちゃん ; My Friend's Abnormally Cute Sister
• Genre(s): Comedy School Life
• Author(s): Fuyujima Kure
• Status: Ongoing Download Manga
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Summary: Yanagi, a second-year high school student, has a faint crush on Mizuki, the younger sister of her childhood friend Momo.One day, while rummaging through Mizuki's personal belongings in her room, Yanagi discovers the truth about Mizuki...?