Despite being mother and son, Touko and Yuki ended up having a physical relationship. Yuki got a job and eventually left his mother, but Touko still saw Yuki as her beloved. One day, Yuki suddenly contacted Touko and said, "I've got a girlfriend," and Touko became extremely jealous. She then called Yuki to a hot spring resort, saying, "It's been a while since I've seen you."