Using a game by Guilty.

Kaoru is really a high school graduation student. He has an old friend, Nanao, in the same school. She's got been giving him sexually insulting orders looking at other students anf the husband has always obeyed it. But one day, his patience expires and decides to adopt revenge on her behalf. While he still plans how to acheive it, he accidentally witnesses Mayu, his classmate, shoplifting. He makes up his mind to use Mayu as his pawn.