Kyouiku Jisshuu ~Joshikousei Maniacs~

The plot of "Kyouiku Jisshuu ~Joshikousei Maniacs~" is rather simple: the protagonist is an ordinary Japanese man named Shingo, who is about to become an intern in a prestigious school. There is only one thing that makes the young man slightly nervous: all his students will be girls. And if that weren't enough, some of his new co-workers are young attractive women. Will Shingo concentrate on his job or succumb to the pleasures of the flesh?

[From Moby Games]