Marina, the perfect stepmother, has always been an object of admiration for her stepson Daiki—yet also someone distant and untouchable. But one day, Daiki discovers a hidden side of Marina, shocking him with her true nature. The moment he becomes aware of her sexual side, his feelings can no longer remain mere admiration. Fueled by shock and desire, he develops an overwhelming urge to possess her. This clash of conflicting emotions becomes the catalyst that drives their story into deeper, forbidden territory.