Bonkura Onmyoji's Demon Wife

Seri is a university student who is at a loss for a place to live after her apartment burns down just as she is fired from her part-time job. She meets a man named Kouga by chance in a park and decides to contractually marry him on the condition that he provides her with food, clothing, and shelter. However, Kouga, who claimed to be a civil servant, is really an "onmyouji"...!?

Source: Akita Shoten, machine translated