Arisa's son is always attentive toward his mother, deeply drawn to her presence. One day, he accidentally catches sight of Arisa masturbating in the bathroom. In that instant, his rationality vanishes completely, overwhelmed by uncontrollable desire. Later, he reaches out and touches Arisa's body while she naps. Awakened in shock and confusion, Arisa learns of her son's feelings, causing her own emotions to waver. Then, she reaches toward his crotch, and a new relationship begins to bloom.