The Imperial Capital, where the "Chimmi," a race that drinks human blood, live integrated into society. Asuko, born into a family that makes a living hunting the Chimmi, reunites with Kuon Byakuya, the leader of the Chimmi who once killed her mother. From Kuon, her target for revenge, she receives a marriage proposal for the sake of a truce between their races…… "You cannot possibly know how much I have thirsted for your blood." A Japanese-style fantasy of "thirsting love" begins, where with every drop of blood, they learn the meaning of love.