Mark Knight is a Descendant of royalty in England and he wants to purchase his family's home. However there are a couple of obstacles in his way.
The Historian, Masami Hazumihoshi, is a fact finder. She goes through the history of Knight's family. In his grandfather's will, he stated Mark has only 3 months to find a woman suitable for marriage or risk losing the one place he called home in the beginning of his life.
It goes from bad to worse when he feels a growing connection, attraction and admiration for Masami Hazumihoshi, who is engaged to another man. Takeshi Kumori is Masumi's fiancé. Masumi's twin sister, Ayako is in love with him. When Ayako finds out how Mark feels, she tells him to win Masumi at all cost; so they both can get what they want.