The fourth volume the OVA shipped on February 22 and the fifth volume shipped on March 29.
Akiyuki Simbo (Bakemonogatari, Puella Magi Madoka Magica) is serving as chief director and working with Fuyashi Tou (Bakemonogatari, Nisekoi) on series composition.
The first volume shipped on October 26 on both DVD and Blu-ray Disc.
Del Rey previously released the novel in English in 2008, and the second novel in 2010.