The Japanese light novel series by Gakuto Mikumo has been adapted into a new OVA series. According to the official website the show is currently in production. Earlier the series was adapted into a 24 episode anime produced by SILVER LINK and CONNECT that aired between October 2013 to April 2014, later it evolved into a two-part OVA "Valkyria no Oukoku-hen (Kingdom of the Valkyria)" done by the same production team, including the director Hideyo Yamamoto, and was released in November and December 2015.
The story is a school-life, action, fantasy that relies heavily on the supernatural. It begins with Kojō Akatsuki, a boy deemed the "fourth progenitor" aka the world's most powerful vampire, once thought to only exist in the realms of legend. The main setting is in the Demon District in Itogami City; a special area for demons. Also, a girl named Yukina Himeragi (Risa Taneda) appears who is an apprentice swordsman, and is entrusted with watching over and observing Kojo or if needed, possibly hunting him down. Kojou and Yukina befriend a wide array of monster students, some of whom are attracted to Kojou. These situations drive his libido and his fervor also conveniently happens to provide the source of much of his power. So in a way his desires seem to be the key to his ability. Besides Kojo and Yukina, other characters include: Sayaka Kirasaka- a “war dancer” who dislikes almost all men and is very overprotective of Kojo, Asagi Aiba- Kojo’s classmate who has a crush on him, Natsuki Minamiya- an attack mage who is Kojo’s English teacher; who also happens to have the body of an adolescent despite being in her 20’s.
The cast includes Yoshimasa Hosoya as Kojō Akatsuki, Rise Taneda as Yukino Himeragi, Asami Seto as Asagi Aiba, Rina Hidaka as Nagisa Akatsuki, Ryota Ohsaka as Motoki Yaze and Hisako Kanemoto as Natsuki Minamiya.
