Manatsu, a female student, visits the home of her shut-in classmate, Masao. She has been asked by her homeroom teacher to deliver some handouts. Manatsu, an honor student, accepts the request and arrives at Masao's house. However, when she presses the intercom, no one answers. Just as she is about to leave, Masao's father, Oki, appears and calls his son a "bad brat." Enraged by his words, Manatsu ignores his pleas and enters Masao's room. As soon as Masao sees Manatsu, he forcefully pins her down...