凌辱学園～部活調教恥獄責め～

Main character is a human resources teacher who reports directly to the underground training council. His job is to find promising women to obey their bosses and turn into slaves. He selects three student girls and promises them an overwhelming bureaucratic career if they follow his training course obediently during a month. Their parents sign a written agreement, and severe training starts.

[From vndbreview]