Tsumugi is a rebellious teenager who openly despises her stepfather, Ryou, and dreams of ending his marriage to her mother. While her best friend Saki attempts to recruit her into the world of sugar dating, Ryou secretly obsesses over Tsumugi, eventually deciding to "discipline" her through forced intimacy to ensure her obedience. As their relationship shifts into a dark and illicit secret, Tsumugi finds herself trapped in a cycle of hatred and submission, culminating in a tense encounter where Saki discovers Ryou's true identity.