[1] Shortly after their formulation, Kenji03 met his brother's friend Macchin, who joined the band as its drummer[1] and rounded out the quintet.

were created as theme music for the PSP game Tales of the World: Radiant Mythology 2, which was released exclusively in Japan on January 28, 2009.

Their single One Step!/Tomorrow Never Knows was released on January 27, 2010; "Tomorrow never knows" was used as the background theme music for a DyDo coffee commercial featuring Japanese surfer Teppei Tajima.

In 2013/14, the band composed and performed two opening themes for the anime series Gundam Build Fighters, called "Nibun no Ichi" (ニブンノイチ, "One Half") and "wimp ft. Lil' Fang (from FAKY)";[2] the latter features vocals by Lil' Fang from the group FAKY and aired from episode 14 onwards.

They were invited back to perform at Anime USA in 2013 after a 6-year break from the US and were also star guests at Pacific Media Expo shortly after.

Gori and Shu quit the band after this show, leaving Back-On as the duo of Kenji03 and Teeda.