没落令嬢と闇金教授の契約遊戯

After her wealthy family falls from grace, Seraphina signs a humiliating contract to repay a crushing debt. To her shock, the ruthless kingpin behind the underground lending empire is none other than Elias—her refined, seemingly celibate university literature professor. By day, he is a respected scholar; by night, a powerful man determined to control her fate.