Sota Nishino is a good-looking high-school student. He meets Mai, who is his friend Yukihiro Nanase's younger sister. She is also a high-school student and somewhat naïve. Sota Nishino mutters to Yukihiro Nanase, "Your sister is cute." Mai overhears Sota's remark through the thin wall between her room and her brother's.
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My Brother's Friend is a 2018 Japanese romantic comedy film based on Modomu Akagawara's 2015 manga series Anitomo. Directed by Ryo Nakajima, it stars Ryusei Yokohama and Risaki Matsukaze.