Kohei is engaged in an affair with his stepmother, Miharu, and feels intense inner conflict in his daily life. While he struggles with guilt toward his father and moral dilemmas over their physical relationship, accumulating severe psychological stress, he cannot suppress his youthful, instinctual desires. Drawn to Miharu as the closest woman in his life, he finds himself unable to break free. Eventually, he confides in his longtime friend Keita, revealing everything—including Miharu's existence—taking a self-destructive step that will change everything.