An inappropriate relationship with a student. Yu knows that it is unbecoming of a teacher. But the more he feels a sense of guilt, the more he gets fired up, and he enjoys the thrill, confident that he will not be found out. However, recently, the hotheaded student has begun to press for a relationship even at school, seeking further excitement. No matter how much he scolds or calms him down, the student does not stop. Yu can only writhe in silence, trying not to make a sound at least.