Ultra Blue is the sixth studio album by Japanese-American singer Hikaru Utada, released on June 14, 2006, by Eastworld. It is their first original Japanese language album in four years, following Deep River (2002). Ultra Blue contains thirteen songs, including six singles released between 2003 and 2006. While the arrangements for Deep River were done collaboratively, all but one of the songs on Ultra Blue were written, composed, and arranged solely by Utada, who also did the programming.