This 2013 single by Oldcodex showcases their signature high-energy rock sound with electronic elements. "Rage on" was prominently featured as the opening theme for the anime Free!.
- The single "Rage on" was released on July 17, 2013, by Earkth. It reached the 20th position on the Oricon weekly charts. The track was written and composed by the band members Ta_2 and York.
- "Rage on" served as the opening theme for the first season of the anime series Free!, which aired in 2013. The single's success contributed to Oldcodex's growing popularity.
- The single was released in two versions: a standard edition and a limited edition featuring a DVD with the music video for "Rage on".
Oldcodex is a Japanese rock duo known for their energetic live performances and blend of rock and electronic music. Formed in 2009, they have provided theme songs for various anime and video games.
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