Since graduating from high school, Kazuya has been living with his mother Mirei without working. He has fallen in love with her as a woman, as she raised him alone. Because of this, he has never tried to become independent, as he does not want to leave Mirei's side. Mirei, his mother, has no idea about his feelings, so she invites her boyfriend Kai to her house. As Kazuya watches the two of them get along, his obsessive love explodes. Later, Kazuya invites Nakata and Kita, his seniors at his part-time job, to his house, and sells out his real mother...