"Beautiful World" debuted on the radio and was released as a ringtone on July 23, 2007, and after as a physical single on August 29, 2007.

[8][9] "Beautiful World" was performed during Utada's two date concert series Wild Life in December 2010.

[10] In 2009, the song was rearranged by Russel McNamara for the second film of the Rebuild of Evangelion series, as "Beautiful World (Planitb Acoustica Mix)".

[11] It first appeared as the final track of her second compilation album Utada Hikaru Single Collection Vol.

[12] The music video of the song was directed by Neon Genesis Evangelion director Hideaki Anno, giving a glimpse of Utada's personal life in the United Kingdom.

[13] Critics noted the bittersweet tone of the song resembles much of her earlier work such as Ultra Blue and Heart Station.