a popular work from the beautiful girl library has been made into a live-action av! suddenly, the top-ranked, cheerful gal in the class becomes my younger sister!? a super erotic live-action adaptation of a youth support romantic comedy h novel with rino, a 'gal younger sister' who is kind and grants any wish, and the protagonist who aims to become a novelist! momoka kato gives a passionate performance as a gal younger sister who is erotic and loves h! the two people's heart-pounding first experiences, secret sex in the boys' restroom, nurse cosplay care in the bath, and going wild with horny sex! making them cum like crazy!