Back-On debuted with the mini-album Adachi Tribe in October 2004. The band also contributed tracks to underground hip-hop compilations, and by the end of the year was attracting 200 fans to club shows in Tokyo's Shibuya district. The following year, Back-On kept the momentum going with constant touring -- by the end of 2005 the band had clocked up more than 100 shows in a year, including gigs with like-minded bands such as Rize and Screaming Soul Hill, and recording their debut "major" release, Baby Rock, for Avex Trax's rock-oriented subsidiary imprint label, Cutting Edge. But it was Back-On's next release, the 2006 single Chain, that truly launched the band, the song receiving a boost by being chosen as the opening theme song to TV Tokyo's animated Air Gear, a series that has also been licensed in the U.S. Typically, the track featured Teeda's rapping and a chorus sung by Kenji03. Another mini-album, New World, followed in November.
Back-On kept the anime connection going in 2007 by providing the opening theme "Hikari Sasuhou" to the direct-to-video title Murder Princess and contributing the songs "A Day Dreaming..." and "Blaze Line" to Eye Shield 21 -- logical, then, that the group should also perform at the anime fan conventions Anime Matsuri in Houston and Anime Evolution in British Columbia, Canada. ~ David Hickey, Rovi