After a life of loneliness, the crossdressing Mito has finally found a place where she belongs--living in a boys' dorm as a vampire's thrall! Ruka doesn't know she's a girl, yet he showers her with love in order to sweeten her blood. But just as Mito thinks she's found happiness, she finds out that every vampire has a fated partner...and that Ruka is only using her as a temporary substitute. Meanwhile, Mito ends up in close quarters with the mysterious Ren, who has vowed to protect her from being turned into a vampire. Why does he care so much? Could he be falling for her...?