Ever since childhood, Takashi had known his mother Mio was unfaithful. Every time his father was away, Mio invited other men into their home, and Takashi secretly watched it all. Mio's habit of cheating left deep emotional scars on Takashi's heart. One day, he caught Mio masturbating in her own room. Unable to control himself any longer at the sight, Takashi passed out. When he approached the awakened Mio, his chest burned with uncontrollable desire for his mother. The obsession he'd carried since childhood had now transformed into an overwhelming impulse.