The defiant love story of a lovesick guy

The defiant love story of a lovesick guy: This guy has a special relationship with Suzume Mino, that is, the two have drawn up a love contract that binds them both. But then Suzume Mino changed and she had a new lover and wanted to break up with this guy in silence, but then this guy still refused to agree and hunted her down to have sex with some other guy. After that, he forced Suzume Mino to stay at home and serve him sexually every day, despite Suzume Mino's change of heart. What will Suzume Mino have to do to escape this scene?