Rin x Sen: Hakudaku Onna Kyoushi to Yaroudomo

Urara starts working at a girls' school.

She is now happy because she will get married in a few months.

But one day, her fiance suddenly goes missing since his business didn't go well.

Months later, Yuji, a debt collector, comes to her house, but she doesn't have enough money to pay.

Yuji offers her to work at a boys' school his friend works.

He also says if she works there for a month, she won't need to pay back money.

She finally decides to accept his offer without knowing the fact that the school is full of evil teachers and students....