Ultra Blue

Ultra Blue (stylized in all caps) 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 received mostly positive reception from music critics. The album was a commercial success in Japan, selling over 500,000 copies in its first week and debuting at number one on the Oricon Albums Chart. By the end of the fiscal year, it became 2006's best-selling original album by a Japanese female soloist. It was also the fourth most downloaded album of the year on iTunes Japan, and was certified as a million-seller by the Recording Industry Association of Japan (RIAJ). During summer 2006, Utada held a nationwide concert tour to help support the album titled Utada United 2006.