Saint Dorei Gakuen 2

A wealthy family's academy gets a mole: Kuga Kei transfers in posing as an ordinary student while working for the Nishiki family, whose actual business is training and selling sex slaves. Nobody at Saint Orkis knows what they've let through the front gate.

The setup is corporate sabotage dressed up as a school drama. The Azuma family runs the academy on reputation, the Nishiki family wants that reputation broken from the inside, and Kei is the tool they've sent to do it, close enough to the Azuma daughter to do real damage before anyone catches on.

Play follows Kei as he works his way through the student body, using the access his cover gives him to manipulate, blackmail, and break down the people standing between the Nishiki family and the Azuma family's downfall. It's a visual novel with voiced scenes rather than a management sim, so the loop is reading, choosing, and watching the infiltration play out rather than juggling systems.