It seems a perfect recipe for disaster: Nitona-kun and Mamai-chan grew up together, living just around the corner from each other. But temptuous Mamai-chan has always treated Nitona-kun as her lackey. Nitona-kun has become sex friends with his classmate, Shirai-chan. While Mamai is in a student council meeting after school, Nitona and Shirai slip away to spend time together in private. But a suspicious Mamai surprises them while they're having sex. But this is hentai... Shirai shocks Mamai by insisting it's Mamai's fault! Will true feelings be revealed?