Tokyo Jihen were formed by singer Shiina Ringo, who strove to make a turn in her career, abandoning the showy image and flamboyant pop she specialized in with her solo work. The new approach involved a more stripped-down sound that took cues from rock and smooth jazz, and although it featured many elements unconventional for J-pop, it still proved to hold a strong commercial appeal, even if less than that of Shiina Ringo's solo records. Shiina formed the band in 2003, after releasing three solo records, and the group featured four more members, all of whom played in Shiina's live band. Tokyo Jihen had two number two singles in the same year, and their debut album, Kyoiku (written entirely by Shiina) came out in the end of 2004, also reaching number two on the Oricon charts. In 2005 the band was slowed down by the departure of the two members: guitarist Hirama Mikio, who went to work solo, and HzM (Hiizumi Masayuki), who returned to his old band Pe'z.