Female student Mitsuki visits the home of her classmate, Kenta, who is a hikikomori. However, no one answers when she presses the intercom. As she tries to leave a printout in the mailbox and go back, a man named Dan'go appears. Dan'go claims to be Kenta's father and refers to his own son as a 'worthless brat.' Enraged by these words, Mitsuki ignores Dan'go's attempts to stop her and enters Kenta's room. Kenta, who was standing there, immediately forces Mitsuki down…
