Mitsuki (Tenka Hashimoto) and Yuya (Yukichi Kobayashi) become stepsister and stepbrother because of their parents’ marriage. Mitsuki can’t get along with her new family and Yuya doesn’t know how to approach his new stepsister. One day, Mitsuki becomes possessed by the spirit of Hiyori (Mayu). Hiyori likes Yuya and believes Yuya can help her get to heaven. Hiyori places a leather chastity belt upon on Mitsuki and a plan takes place to help send Hiyori to heaven.

Film adaptation of the same-titled comic popular for its extraordinary premise. Up-and-coming Yoshida Kota, known for his humorous yet sensual style in films like Usotsuki Paradox, creates a unique coming-of-age drama about love between two girls, with elements of sports and perseverance sprinkled throughout. The “Torture Club” is an official afterschool activity at the private school Saint Honesty Gakuen. Yuzuki (Kijima Noriko) has no idea about the club when she enrolls, and gets abducted by the club members and hauled off the clubroom. There, she finds out that upperclass student Aoi (Yoshizumi Haruna), her secret idol, is in the club, and decides to join, but…