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300 km south of Tokyo lies Itogami Island - a man-made landmass that’s been authorized by the government to house spirits, vampires, mermaids, and other magical beings who’ve been pushed to the brink of extinction. Kojou Akatsuki is one such resident who used to be a typical high school boy, until an incident 3 months ago turned him into the Fourth Progenitor - a powerful vampire - against his will. And while he’d rather stay an anonymous teenager, things change when Yukina, a sword shaman from an anti-terrorism agency, arrives with intentions to watch over and potentially eliminate Kojou...
Kingdom of Aldegyr and the Lost Warlord's Dominion are holding a signing ceremony to extend their mutual non-aggression treaty. While La Folia is with them, Kojou does not anticipate meeting them as they are busy with work. However, an evil terrorist plot threatens the signing ceremony and it is up to Kojou and Yukina to stop them from succeeding.
The OVA will start by depicting the story in the ninth light novel volume and will take place in Blue Elysium, a resort facility near Itogami Island.
The Seven Deadly Sins aid the Sky People against a powerful group of demons hellbent on resurrecting a demonic beast sealed over 3,000 years ago.
The story is set at a private school that brings together “Saviors” – students who have awakened memories of their past lives as Shirogane or Kuroma. Shirogane use weapons gleaned with Puraana from their bodies to fight enemies, while Kuroma use magic by manipulating Maana to banish their foes. Moroha Haimura has just enrolled into the private school and is the first Savior in history who has awakened memories of being both a Shirogane and Kuroma.