Despite promising to protect her child, the single mother decided to send Sato to her stepbrother Aki in the city to take care of him while Sato was preparing for the university entrance exam.
Aki, an old and lustful fox, knew that his younger sister Hasu had a beautiful son named Sato. When he found out that Hasu was going to the city to study for the university exam, he eagerly invited his nephew to his house to take care of him. Trusted with the care of his nephew, Aki secretly rejoiced and quickly devised a plan to take advantage of the young girl about to step into the difficult and painful university life.
...
As soon as Sato arrived at his house, the cunning step-uncle immediately locked the door and proceeded to assault the beautiful niece. He saw Sato as a sex doll, and whenever he had the opportunity, he forced the niece to "serve" him.
