Saint Seixi Montblanc is a 17-year-old girl forced into marriage with four women in exchange for her freedom. The youngest of the Montblanc family, she never experienced a loving relationship with her parents. A skilled racer and fiercely independent, Seixi knows how to take care of herself. At their university, she's known for always being on top- beautiful, brilliant, and everything anyone could ever dream of. But what happens when she's suddenly tied to four strangers through marriage?