The female student, Kano, visits her classmate Masahito's house, who is a hikikomori. However, no one comes out even after she presses the intercom. When she tries to put the print in the mailbox and leave, a man named Kita appears. Kita says he is not a family member of Masahito, but calls Masahito a 'bad kid'. Angered by his words, Kano ignores Kita's stop and enters Masahito's room. Masahito, who had been standing there, pounces on Kano as soon as he sees her, and starts to devour her body. Then, the people in the room also join the act...