- O2First opening theme (episodes #1-12)Performed by ORANGE RANGELyrics and music by ORANGE RANGE
- COLORS
- Shiawase Neiro(The Timbre of Happiness)First ending theme (episodes #1-12)Performed by ORANGE RANGELyrics and music by ORANGE RANGE
- Yûkyô Seishunka(A Song of Chivalrous Youth)First ending theme (episodes #1-12)Performed by Ali ProjectLyrics by Arika TakaranoMusic and arrangement by Mikiya Katakura
- WORLD END
- Kaidoku Funô(Decoding Inefficiency)Second opening theme (episodes #13-23)Performed by JinnLyrics, music, and arrangement by Jinn
- Waga Rôtashi Aku no Hana(My Beautifully Elegant Flower of Evil)Second ending theme (episodes #13-25)Performed by Ali ProjectLyrics by Arika TakaranoMusic and arrangement by Mikiya Katakura
- Mozaiku Kakera(Mosaic Pieces)Second ending theme (episodes #13-23)Performed by SunSet SwishLyrics and music by Junzô IshidaArrangement by Masayuki Sakamoto and SunSet Swish
- Hitomi no Tsubasa(The Wings in My Eyes)Third opening theme (episodes #24 and 25)Performed by accessLyrics by Akio InoueMusic and arrangement by Daisuke Asakura
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