Teacher is actually a super masochist with a crush on his delinquent student (like posters up in his room crazy stalker kind of crush). But one day Harumi sees sensei masturbating on his desk and tries to blackmail his perverted teacher. Unbeknownst to him, this has made sensei's dreams come true so he can finally get his hands on his student. A wild ride (just like sensei ;P)
Kudou Sensei no Majestic Days