Nana is a tomboy who is the best in Sakurabayashi High School in the second stage of Kendo because she is fighting and has a rough wording. She has a complex with a small and desperate flat bust. One day she was seen naked by Playboy Shintaro, a rugby club ace in the same class, because she was using a men's shower room. This led to a "duel" between the two ...? The two who quarreled with each other eventually went on to swear their love over their lifetime. And a ruthless fate awaits them ... Ayako Shibata's Orthodox Pure Love Gekiai Gakuen Love Story!