Erina visits the home of her shut-in classmate, Ichiro. However, when she presses the intercom, no one answers. When she is forced to leave, Kenta, claiming to be Ichiro's father, appears. Kenta calls his son a "bad brat." Enraged by his words, Erina ignores Kenta's pleas to stop her and enters Ichiro's room. As soon as Ichiro sees Erina, he attacks her and pins her down. Then the man in the room and Kenta join in, leaving the frightened Erina in a mess...