Karin is a younger sister who tends to be a shut-in and is a sissy complex.The brother, worried about his future, suggests that he should interact with others on a matching app, in mind for his younger sister.Karin has the courage to meet a man, but unfortunately he is fucked by a scumbag.After his precious little sister was hurt, the brother vowed to not let Karin go, and the two comfort each other as they confirm their bond.
