姪のビッチ化が許せない！

Hiroki Ashihara just wanted to spend college break doing his thing,
but he was asked to tutor his brother's daughter Chisaki.
The last time Hiroki saw Chisaki she was a little thing, but that was years ago.
Still, he wasn't prepared for the shock of a dye-blonde suntanned gyaru. Chisaki was very obviously slutty. How could he help her with school when she only cares about sex?
What the precocious bitch needs is...

[From DLsite English]