"Hikari" (Japanese: 光, "light") is a song recorded by Japanese recording artist and producer Utada Hikaru for her third studio album Deep River (2002). The song was written, produced and co-composed by Utada herself, while additional production was handled by long-term collaborators Akira Miyake and her father Teruzane Utada. "Hikari" was originally written and recorded for the video game Kingdom Hearts and was eventually added to the video game as the official theme song, while an English-language version "Simple & Clean" was used for the international editions. The single was then added to her studio album, along with her compilation album Utada Hikaru Single Collection Vol. 1 (2004).