The album has also been released on iTunes in Japan and other countries, including the United States.

[1] This became the highest first week sales of a female soloist's debut album since Mika Nakashima's True, released nearly four years prior.

[2] First message sold 711,299 copies by the end of 2006, making it the 13th best-selling album of the fiscal year.

[3] First message managed to sell an additional 406,290 copies by the end of the following year, making it the 22nd best-selling album in Japan of 2007.

[4] The album surpassed the million-selling mark during its 24th week on the charts, on April 23, 2007, making it the first time in three years since Avril Lavigne's Let Go that a female solo singer achieved a million-seller in Japan with her first album.