Noble Academy Leadership Under Humiliating Sanctions (気高き学園執行部)

The protagonist is a janitor of an academy for well-heeled communities. Behind the scenes he threatens pupils with secrets he digs up and uses some bad students as tools.
Thus he finds himself in a pinch when an security enforcement committee is founded to fight against delinquency.
To reverse the situation, he comes up with an idea to uncover the secrets of the members of this committee to make them his sex slaves.