Several years into their marriage, the Makita couple have yet to be blessed with children, and gradually begin feeling a sense of dissatisfaction in their relationship. One day, they witness their neighbor, Mrs. Ishino from a prestigious academic family, scolding her son Manabu. Despite having exams approaching, Manabu's mind is consumed entirely by lustful thoughts. Seeing this scene, the Makitas feel something shift inside them, and soon become irresistibly drawn to Manabu's overflowing sexual desire. Secretly, without telling her husband at first, Kaede Makita develops a desire to deflower the young virgin herself, sparking a new and forbidden relationship.