One day, his niece, Amamiya Kotoha, suddenly appeared standing in front of his house. Her mother—his divorced older sister—had gotten involved with a new man and kicked her out of the house. So began his life living with his niece in the house left behind by his deceased parents.

“I love you so much, Uncle. I'm so happy we get to live together.”

Perhaps lonely without her parents, she clung to him constantly, always wanting to be together. They shared the same bath and slept in the same bed.

He witnessed his niece masturbating while thinking of him, and unable to resist, he ended up having sex with her. Time passed, and after her first period, she begged him for a baby. Responding to her wish, they began making love to conceive a child.