One day, a mysterious virus appeared that killed all human adults die, and vampires suddenly appeared taking the surviving children underground. ...

Four years later, Yuichiro Hyakuya is a soldier in the Japanese Imperial Demon Army, but he gets suspended for insubordination. As punishment, he attends a school with th ...

Yu, Yoichi, and Shinoa go to a restricted area to save someone who was possessed by a demon there. ...

Mikaela, who was thought to be dead, was actually turned into a vampire by Krul and is working with them. Meanwhile, Yuichiro starts his first day at the Extermination Un ...

Eager to obtain the Cursed Gear, Yuichiro tracks down Guren and persuades him to provide him a chance at the Contract Ceremony. Passing Guren's test, Yuichiro, Kimizuki, ...

Kimizuki, Yuichiro, and Yoichi fight against the hallucinations caused by the Black Demons they chose in order to attain their power. They face their tragic memories and ...

Yuichiro, Shinoa, Kimizuki, and Yoichi meet Mitsuba Sangu and form a squad lead by Shinoa. They leave the walls of the Japanese Imperial Demon Army to exterminate vampire ...

With the information obtained from the little girl they saved, Yuichiro and his squad goes to the subway station where the vampires are in order to free the people. Howev ...

After saving the captured people from vampires, Yu and his unit reach Shinjuku. However, by the time they reach there, the war had already begun and some vampires had got ...

Learning that Mitsuba, Kimizuki, and Yoichi are in a pinch, Yu and Shinoa rushes to their rescue. Meanwhile, Guren and his troops fight off the vampire's main forces, but ...

Finally, Mika and Yu reunite, but their circumstances does not allow for much time. Mika tries to save Yu from the humans, who have been experimenting on him, but Yu want ...

Trying to figure out what happened to Yu, Shinoa tracks down Guren and asks what he�۪s conspiring to do. However, Guren doesn't answer and keeps it a mystery. Whe ...