The Demon Emperor Is Back, I Will Be a Nanny for the School Beauty

The Demon Emperor has returned, and trillions of assets around the world are waiting for me to inherit, but I just want to be a campus nanny! Just because of the remnant soul of his deceased wife, he was reincarnated as the iceberg school beauty of the aristocratic academy. She regarded me as a poor student and recruited me as a life assistant, but she didn't know that the entire college was my property.