"Is anyone there? Help me!" Ai, a teacher, was patrolling the classroom after school when she heard a voice calling for help. There, she found her son's friend Fujikawa, handcuffed and with a confused look on his face. It seems that her son's pranks had escalated and he ended up handcuffed. Ai tries to help, but she can't find the key. Fujikawa says he knows where the key is, but... "The key... is tied to my penis." Ai, speechless, pulls down Fujikawa's pants...