At an all-boys school, where it's said that 90% of the entire school's population is gay, high school third-year Kouichi Nanase shares a mutual love with Heiji from his school club. Happy to join the school's 90%, Kouichi is gradually warming up to the idea of his relationship with Heiji developing to the next step, but when his brother Youichi stumbles in on a steamy moment between the two, Youichi refuses to allow them to date at all! Can Kouichi and Heiji wrestle past this devastating obstacle in their relationship?!