Onna Kyoushi - Yumi no Houkago

Hiromi Hayama is a beautiful English teacher working at "Seimei." Unknowingly taking a sleeping pill the vice-principal Ishikuro passed her, she passes out at a party. He takes her into his private office and tries to rape her. Luckily, she wakes up and escapes!
The next day, he pretends he had had too much to drink and was just fooling around.
Hiromi is really pissed off and insists on his resignation, but this jerk won't listen to her and even starts to make plans to try raping her again...

[From gamelexgs]