Mao Hamasaki, married into a wealthy family, begins to seduce her bedridden father-in-law, Tokuji, expecting personal gain. Initially driven by financial motives, she gradually succumbs to her own desires as their forbidden relationship intensifies. Behind her husband's back, she indulges in illicit affairs with Tokuji, becoming increasingly addicted to the pleasure they share. The story unfolds as both characters navigate the blurred lines between lust and morality, drawn deeper into a taboo bond.