Shortly after remarrying, Yumi's husband was tasked with a big project and their nighttime affair stopped. She waited patiently for her husband's work to settle down, but six months had passed and there was no sign of it settling down, so she continued to comfort herself. One day, as Yumi was indulging in her usual pleasure, she was suddenly attacked by her stepson, Shinichi. "I can treat you better than your father..." Shinichi's sweet whispers caused doubts in Yumi's Kokoro...