Seri, a university student, finds herself without a place to live after her apartment burns down and she gets fired from her part-time job. She meets a man named Kouga in the park and decides to enter into a contract marriage with him in exchange for food, clothing, and shelter. However, while Kouga claims to be a civil servant, his real occupation is that of an onmyouji...?!

(Source: Akita Shoten, machine translated)