User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 17: May 2013/@comment-10425110-20130605131637/@comment-5840892-20130606041552

Simple Captain Genius, they already made the OVA months ago to be released at a later time. Which they do by the way....In order to make an OVA for a release, they have to script, story board, and animate, then finally add sounds/dialog into a finished product, but on a crapload of DVDs to be distributed to the public. A process that takes 6 months at the very least.