Allargando The Animation(2015)

Original title: アラルガンド The Animation

Long before Minase revived the Magic Club with his sex magic, the original club was run by Miss Takashiro. When she was a student alongside the future school nurse, Miss Kitami, she found the Black Book. When a raven-haired lesbian joins the club, familiar events are set in motion. Find out how Kitami and Takashiro were introduced to the power of sex!