In the first season, from episodes 1 to 13, the opening theme is "Boku no Kotoba Dewanai Kore wa Boku-tachi no Kotoba" (These Aren't My Words. These Are Our Words) by UVERworld, and the ending theme is "Lapis Lazuli" by Eir Aoi. From episode 14 onwards, the opening theme is "Uzu to Uzu" (Swirl and Swirl) by NICO Touches the Walls and the ending theme is "One Light" by Kalafina.