Claude, a vampire, arrives in a new city in search of human blood and meets a beautiful priest named Rouslan. He is supposed to enjoy his blood, but instead, he is attacked and has his first sexual experience with Ruslan, who marks his arm with the mark of absolute submission. Claude is now being bitten by a werewolf kept by Ruslan, and even by a lowly demon imp!　Kobayashi Kotaro's first unique fantasy BL book!