Adult PC Game: Dieselmine - Nightmare School Lost Girls version 1.0 Final (eng) Archive

Our hero enters a school for training. He had a weird feeling about the strange place as soon as he
passed through the gate, and then a lone girl called out to him. She led him to a classroom... and as
soon as he entered, he was attacked and assaulted.

This is a mysterious school that's not on any map -- nor does anyone seem to have heard of it.
Can our off-track hero find his way out? or will he be trapped in the school forever?