[A popular Bishoujo Bunko work has been made into a live-action adult video!] The top-ranking gal in the class suddenly becomes the protagonist's little sister!? A youthful romantic comedy H-novel about the protagonist's aspiring novelist and his kindly 'gal little sister' Rino, who grants all his wishes, has been made into a super erotic live-action film! Momoka Kato plays the sexy and cute gal little sister who loves sex! The two have their first thrilling experiences, secretly have sex in the boys' bathroom, take care of the patient in a nurse costume in the bath, and have a blast with sex! They're so horny they're climaxing over and over again!