Strike the Blood: Valkyria no Oukoku-hen
English name: Strike the Blood: Kingdom of the Valkyria
Genres: Action, Fantasy, Supernatural, Ecchi
Type: OVA, Episodes: 2
Aired: Nov 25, 2015 to Dec 23, 2015
Studio: Barnum Studio, SILVER LINK., Connect
Source: Light novel
Rating: R+ - Mild Nudity
Synopsis:
It was officially announced at the Dengeki Game Festival 2015 event that Strike the Blood will be getting a two-episode OVA series to be released at the end of 2015. The OVA will be an original story written by Gakuto Mikumo.

(Source: MAL News)