A school changes its rules and drops the traditional grading system. The only way to pass now is to have sex. The more sex you have, the better your chances.
Based on the hentai game by Tinker Bell. Shio Atsushi is a professor who will provide home class to two daughters of different families : Arisa and Maya. But it seems this won`t be only educationnal purpose since the two girls show interest to that man.