Nagi Yanagi
For the first season, both the opening and ending themes were produced by I've Sound. The opening song is "Borderland" by Mami Kawada, and the ending theme is "Ambivalentidea" by Nagi Yanagi. "Borderland" was released as a single on May 30, 2012, while "Ambivalentidea" was released as a single on June 6, 2012. Both songs were released as singles by Geneon Universal Entertainment.