Son Tatsuya begins to question his motherly affection for Yumiri, noticing his lingering gaze. Becoming aware that he sees her as a woman, Yumiri feels an inner tremor stir within her heart. Their relationship, devoid of true love, spirals into twisted desire. Unable to resist their urges, they plunge into a taboo tale filled with sinful pleasure and forbidden ecstasy. As the line between love and guilt blurs, their bond deepens in a new, forbidden way.