Sex fiend Tomoya switches places with a young college professor so that he can have full access to all those young ripe hentai co-eds. He proceeds to seduce and/or rape them one by one, until nearly every girl at the school is transformed into his zombie-like sex slave. It's hard to believe this is part of Critical Mass' "vanilla series," what with all the graphically popped cherries mixed in with a small dose of bondage and S/M and a big helping of dominance and submission.