winter issue that a second season has been green-lit,[3] and aired on October 5, 2013.

[4] The series was also simulcast on Crunchyroll as part of their spring lineup of anime titles.

The first ending theme is "Start it right away" by Hyadain and the second is "Catal Rhythm" (カタルリズム, Katarurizumu) by OLDCODEX.

On October 19, 2020, the SAG-AFTRA listed and approved an English dub for the series under the "Netflix Dubbing Agreement".

[10] The English-dubbed first season debuted on Netflix on January 15, 2021.