A brilliant student since the founding of the school, Ueda, harbored intense feelings for his homeroom teacher, Mami. Desperate to be alone with her, he grew frustrated by the lack of opportunity. As a last resort, he boldly submitted a blank exam paper. As expected, Mami called him out after class, and they were finally alone in the classroom. This was his only chance. Ueda forcefully kissed Mami, and in that instant, the sharp sound of a slap echoed throughout the room.