The OVA story is set before the main story's "Battle in Nagoya" arc. The Shinoa Squad is ordered another mission from Guren to rescue a human girl named Riko from a mysterious vampire Shahal, and bring her back to her family. But Ferid and Crowley also appear when they find Shahal. Can Yuichiro save the girl?

The story takes place in a world where an unknown virus has killed the entire human population except for children under 13. Those children were then enslaved by vampires. The manga centers on Yuichiro Hyakuya, a human who dreams of becoming strong enough to kill all vampires. 
 
(Source: Anime News Network)

Yuuichirou 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, Yuuichirou 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! 

(Source: Official website)

After trumpets of the apocalypse proclaim the fall of humanity, vampires arise from the shadows to rule the earth. Yuichiro wants just one thing—to get revenge by killing each and every vampire.
 
Yuichiro’s dream is near-impossible, given that vampires are seven times stronger than humans, and the only way to kill them is by mastering Cursed Gear, advanced demon-possessed weaponry. Not to mention that humanity’s most elite Vampire Extermination Unit, the Moon Demon Company, wants nothing to do with Yuichiro unless he can prove he’s willing to work in a team—which is the last thing he wants!
 
(Source: Viz Media)
 
Note: Includes 2 extra chapters.

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