The story of Chika, a refined married woman in her thirties, as pleasure gradually consumes her heart. Trapped in the monotony of daily life, she becomes drawn to a man she meets by chance on her way home. With her husband's affection fading and her sense of self-worth as a woman slipping away, Chika can no longer suppress the burning desire within her chest, leading her to choose an affair for the first time. On the night of her first experience outside marriage, her body trembles with overwhelming pleasure. The sensation lingers even after she returns home, and driven by her own will, she begins building a new relationship with that man.