In the city of Obscur; vampires and humans coexist. The vampires are known for their wealth and power while humans are their foods. But not Hinata Shōyō, he's a vampire and nothing more than a slave. He lives while dying, he starve and thirst for blood, he works himself to death. But then he met Tsukishima Kei... a human. He feeds Hinata, gave him shelter, and finally gave him love... or was it really love? What would he want in return?