High school student Reina visited the home of her classmate, Masao, who was a hikikomori. However, no one answered when she pressed the intercom. Just as she was about to give up on the errand from her teacher and leave, a man named Koji appeared. Koji claimed to be Masao's father and referred to his own son as a 'good-for-nothing brat.' Angered by these words, Reina ignored Koji's attempts to stop her and entered Masao's room. Masao, who was standing there, immediately pinned her down upon seeing Reina. Then the others in the room and Koji joined in the act…
