Miina Wakatsuki, a busty female teacher who teaches as the homeroom teacher of Class 3, has been making frequent home visits to the home of a male student who has been absent from school since last month, in an attempt to somehow help him recover. The student lives in a single-parent household. While comforting the parent who appears exhausted, she continues to knock on the tightly closed study room, but the student does not come out. One day, not giving up, she continues to visit the room and is finally allowed to enter the boy's room, but there, the teacher is greeted by the student's huge penis...