When Mahiro was in junior high school, his mother remarried. Her new husband was a 55-year-old, dull-looking man. However, Mahiro gradually opened Kokoro to his gentle personality. Suddenly, he realized that he had begun to think of him as a man... And then, one winter night, while his mother was away... "I love you, Daddy. I want you to kiss me more..." The two of them crossed the line...