Rin x Sen: Teachers and Dolls / Rin x Sen: Hakudaku Onna Kyoushi to Yaroudomo

The main protagonist Urara-chan gets a job at a girls' school. She lives a calm and happy life and is soon to get married. But suddenly her fiancé disappears, leaving her with a bunch of debts. And a few months later, Yuji comes to Urara demanding to repay the debts. Since she doesn't have that money, he suggests she work at a boys' school. Urara has no choice, and she agrees.