Narumi's mother passed away three years ago, and she lives with her father. Her father works hard for her, and seeing her father like that, the daughter grows up healthy and earnest, and the two live together happily. However, as the girl grows up, she begins to feel love for her father, to the point that she even feels Kokoro of her late mother. She tries to suppress these feelings by masturbating every day to control herself, but one day, when she can no longer contain her love and lust for her father, the daughter takes drastic action!