Kiyo Katsuragi, a high school student, inherits a grand mansion from a grandmother she never knew she had, only to find it already occupied by the dhampir Kuroboshi and his vampire servant Alshu. Kuroboshi promptly names Kiyo his bride, the one human he intends to feed on, and starts flirting with her at every opportunity. This two-volume shoujo comedy follows Kiyo as she tries to keep her studies and her new household in order while sharing a roof with the two of them.