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In January 2003, the documentary television program, "Artist Document Kami ga Maioriru Shunkan: Chihiro Onitsuka 22 sai no Sugao" was broadcast on NHK. Onitsuka released a single "Sign". To promote the single, she appeared several television variety shows, including "Mezamashi TV" and "Waratte Iitomo!". As a result, the single peaked at number four on the Oricon Weekly Singles chart, becoming Onitsuka's　highest charting song on the chart. Her follow-up single "Beautiful Fighter" was released in August 2003. It was commercially less successful than her previous singles, selling only 36,000 copies. However, it managed to peak at number nine on the Oricon Weekly Singles chart.