Shinya is a childhood friend of Yukie's daughter, Kiyoka, and is one year older than her. Yukie considered Shinya like a son, as he had looked after Kiyoka since childhood, acting as her tutor. Shinya, who grew up in a single-parent household, also considered Yukie like a mother. However, as he grew older, he realized the mistake in his feelings for Yukie. "Not as a mother, but as a woman..." As his possessive love for Yukie grew stronger, Shinya...