Video information
The 4th season of the OVA, *Blood Blockade Battlefront IV*, was released in 6 volumes in 2020, on April 8, June 24, September 30, December 23, March 24, and June 30, 2021. Each volume consists of 2 episodes, totaling 12 episodes. The story takes place on the Vampire Special Zone, "Enlai Island." The new battle of the Fourth True Ancestor begins as they lose their memories! On a beach illuminated by moonlight, Shouko Tokisaki wakes up, and before him stands a white-haired girl in a monk's outfit. "I've finally found you, Shouko Tokisaki. My name is Shoukanaya Shizuku, and I am the one tasked with monitoring you." Floating 330 kilometers south of Tokyo, the Japanese "unique" Vampire Special Zone, "Enlai Island." With no memories other than his name, and unable to summon his Fourth True Ancestor'sGuardian Beast, Tokisaki embarks on a cruel mission with his new companions on this isolated island in the middle of the ocean. What is this task they are facing?