The manga inspired a 13-episode television anime series that premiered in January 2014.
Hiro Kaburagi, who directed the previous television anime series, returned as chief director for the OAD.
The official website for the anime had teased in December that the event would reveal the third work in the new anime project.
The manga also inspired three previous OADs that shipped with the 17th, 18th, and 19th volumes of the manga in 2015.
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