Son Takashi spies on his mother Kiyomi as she showers. He fantasizes about deeply kissing her and burying his face into her soft, voluptuous breasts. After her bath, she often walks around braless, fueling Takashi's uncontrollable desires. One day, Takashi catches his mother masturbating. In that instant, his world shifts completely, overwhelmed by shock and confusion far beyond his previous fantasies.