A stately home nestled in a quiet residential neighbourhood. Ryoko Tanigawa hires Misaki Uehara, a former teacher, as a private tutor for her son, Masashi. On the first day of lessons, Ryoko becomes increasingly captivated by the sight of Masashi studying so diligently, and finds herself unconsciously pressing her body close to his. One day, she is left stunned when Masashi’s father returns home unusually early…