Kurozuka - S01

In 12th-century Japan, the swordsman Kurou flees monstrous pursuers into a deep forest with his servant Benkei. Looking for shelter, the two come upon the secluded home of the mysterious and beautiful Kuromitsu. They are welcomed warmly, but warned never to enter Kuromitsu's room. Driven by natural curiosity and perhaps a doomed love, Kurou peeks through the half-open door and finds Kuromitsu feeding on the blood of dead men. He soon learns that Kuromitsu is an immortal vampire, and he devotes himself to her, even becoming a vampire so he can spend eternity with her. But the secretive group known as the Red Army has enlisted Benkei's help, and Benkei betrays Kurou and cuts off his head. Waking centuries later in an apocalyptic modern-day Japan, Kurou sets out to reunite with his lover and take revenge on the Red Army.