The second season of Strike the Blood which adapts three arcs from the 9th, 11th, and 12th light novel volumes.

It was announced at a Dengeki Game Festival stage event that the Strike the Blood light novel series will get a third OVA release. It will cover until the end of Seisen-hen. (Source: MAL news)

With the appearance of a mysterious virus that kills everyone above the age of 13, mankind becomes enslaved by previously hidden, power-hungry vampires who emerge in order to subjugate society with the promise of protecting the survivors, in exchange for donations of their blood. Among these survivors are Yuuichirou and Mikaela Hyakuya, two young boys who are taken captive from an orphanage, along with other children whom they consider family. Discontent with being treated like livestock under the vampires' cruel reign, Mikaela hatches a rebellious escape plan that is ultimately doomed to fail. The only survivor to come out on the other side is Yuuichirou, who is found by the Moon Demon Company, a military unit dedicated to exterminating the vampires in Japan. Many years later, now a member of the Japanese Imperial Demon Army, Yuuichirou is determined to take revenge on the creatures that slaughtered his family, but at what cost? Owari no Seraph is a post-apocalyptic supernatural shounen anime that follows a young man's search for retribution, all the while battling for friendship and loyalty against seemingly impossible odds. [Written by MAL Rewrite]

Yuuichirou Hyakuya is finally reunited with his childhood friend Mikaela Hyakuya, whom he had long presumed to be dead. Upon their reunion, however, he discovers that Mikaela has been turned into a vampire. Determined to help his friend, Yuuichirou vows to get stronger so that he can protect Mikaela as well as the comrades in the Moon Demon Company. Kureto Hiiragi receives information that a large group of vampires will be gathering in Nagoya, preparing for their assault on the Imperial Demon Army's main forces in Tokyo. Led by Guren Ichinose, Yuuichirou's team is one of many selected to intercept and eliminate the vampire nobles. With the Nagoya mission quickly approaching, the members of Shinoa squad continue to work towards fully mastering their weapons, while learning how to improve their teamwork. Yuuichirou must gain the power he needs to slay the nobles and save his best friend, before he succumbs to the demon of the Cursed Gear. [Written by MAL Rewrite]