Hikari (Hikaru Utada song)

"Hikari"
Single by Hikaru Utada
from the album Deep River
Released	March 20, 2002
Recorded	2001
Studio	Bunkamura Studios Shibuya, Tokyo
Genre	Pop folk electronica[1]
Length	5:02
Label	Toshiba EMI
Songwriter(s)	Hikaru Utada
Producer(s)	Utada Teruzane Utada Miyake Akira
Hikaru Utada singles chronology
"Traveling" (2001) "Hikari" (2002) "Sakura Drops" / "Letters" (2002)
Music video
"Hikari" on YouTube

"Hikari" (Japanese: 光, "light") is a song recorded by Japanese–American recording artist Hikaru Utada for her fourth studio and third Japanese language album, Deep River (2002). It premiered on March 20, 2002, as the third single from the album in Japan. It was written and composed by Utada, whilst production and arrangement was handled by Utada, her father Teruzane Utada, and long-time collaborator Miyake Akira. The single, and a remix by Russell McNamara (under the alias PlanitB), was used as the official Japanese theme song for the 2002 action role-playing video game Kingdom Hearts, and appeared on its original soundtrack respectively. Musically, "Hikari" is a pop folk song. Lyrically, it is about mysteries in life and human activities.

Upon its release, the track garnered positive reviews from music critics. Many critics highlighted the track as one of Utada's best singles, and commended her vocal abilities and songwriting. It was also successful in Japan, peaking at number one both on the Oricon Singles Chart and Tokyo Broadcasting System's (TBS) Count Down TV singles chart. It was certified double platinum by the Recording Industry Association of Japan (RIAJ) for physical shipments of half a million units. An accompanying music video was shot by her then-husband, Kazuaki Kiriya; it features Utada washing dishes and drinking water. It was performed on some of her concert tours, including the Utada United and Wild Life tour.

To promote the international formats of Kingdom Hearts, Utada re-recorded an English language version entitled "Simple & Clean". Both the original edit and remix version by PlanitB served as international theme songs. It did not appear on Utada's English studio album Exodus (2004), but the original version was included on her 2009 English studio album This Is the One. It was later released as an A-side 12-inch single with Utada's single "Colors" in 2003, and received positive reviews from most music critics. "Hikari" and "Simple & Clean" were rerecorded in 2024, with the former rereleased for her 2024 greatest hits album, Science Fiction.