Crunchyroll announced back in July 2016 that they’d be getting their series Big Order, which they simulcast, out for release through Funimation on home video.
The original work comes from Sakae Esuno which began serialization in Shonen Ace back in 2011 with eight volumes released so far.
The opening theme was YUI from Yousei Teikoku while the ending theme was Kobore Sekai Oware by Aki Hata.