Kanzaki Hinano is called the “Reaper Princess”; because she absorbs the life force of anyone who comes near her. She is born into a prestigious exorcist family that hunts monsters and spirits, but because of her deadly ability she is feared and lives in loneliness, even blamed for her mother’s death when her power first manifested. One day, a marriage proposal arrives: she is to wed Ryugamine Yukitsu, the former head of a rival exorcist clan. Their marriage is officially just a “white marriage” in name only, a purely formal political union. However, Yukitsu has an immortal body, making him the only person who can stay by her side without being killed by her power.