The ending theme song is "Lost Child" by Momoiro Clover Z. A film adaptation was announced following the end of the series. The film, titled , was released on February 22, 2014, with Satō returning as director and screenwriter. A manga adaptation illustrated by Hiro Tōge began serialization in Asahi Shimbun's "Nico Nico Asahi Comic Fantasy" web manga publication on Nico Nico Seiga from June 2, 2012. A manga adaptation of the film illustrated by Chibimaru began serialization in Media Factory's "Monthly Comic Alive" from February 2014. The manga will be licensed in English by Seven Seas Entertainment, who will release the first volume in August 2015 and will be based off the film version.