When Ritsu's apartment was burned up in a fire, she was rescued by Sagimori, a professor at the university she used to attend. Ritsu, who had lost her parents and had nowhere else to go, was invited to stay the night thanks to Sagimori's good intentions. She was told to stay away from one room in particular, but then she accidentally peeked into Sagimori's unusual secret! Knowing that his fiancé ran away on their wedding day and was still missing, Ritsu had a misunderstanding...? He promised that he's not actually interested in real women, but he offered her a contract marriage!?

(Source: AI Production, translated)