After finishing her daily masturbation, mother Misato enters her son's room to clean, only to have their relationship instantly collapse. At that exact moment, she catches him in the act. Seeing her son's erect cock, Misato's suppressed desires explode uncontrollably. That night, as Misato reflects on her actions in the bathroom and wrestles with regret, her son—feeling something inside him break loose after what happened earlier—now begins pursuing her mature body. The story unfolds with emotional turmoil between mother and son, marking the beginning of a new, forbidden relationship.