(Season 1)
After an unknown virus wiped out all adults on earth, vampires appeared and ruled over the surviving children, treating them like livestock. Yuichiro Hyakuya survived along with other orphans by giving their blood to vampires, until Yuichiro escaped four years ago. Now he is a member of the Moon Demon Company, a unit in the Japanese army dedicated to hunting down the vampires he blames for the death of his family.
(Season 2)
Yuichiro has reunited with Mikaela at the Shinjuku Battle. But Mikaela was turned into a vampire…To save the “family”, and to protect his fellow members, Yuichiro needed to gain knowledge and power. He searched for ways to bring back vampire to human beings, and at the same time, trained hard working on the Cursed Gear.Meanwhile, Kureto calls Guren and tells him a shocking truth. That in one month, the main unit of the vampire will start attacking Tokyo. To get a head start against vampires, Kureto orders Guren to go to Nagoya.The noble extermination mission is about to open fire!