At the suggestion of a close friend, 29-year-old Mizutani decided to relive his youth by posing as a high school student. However, his carefree days are disrupted when his homeroom teacher Kuriyama starts watching him suspiciously. Things take a surprising turn when Kuriyama catches Mizutani at a bar, where they end up at a love hotel and Kuriyama confesses her love for him. To add to his troubles, Mizutani is blackmailed with photos and forced to start a relationship with his teacher. This manga also includes the one-shot "Emergency Kisses, Please!" (Oukyuu Kiss, Onegaishimasu!)
