What is the Japanese title of "Simple and Clean"?

The Japanese title of “Simple and Clean” is “Hikari.” Hikaru Utada originally recorded the song for the Japanese version of the first Kingdom Hearts, where it appeared under that title.

“Hikari” means “light” in Japanese, a fitting name for a story centered on darkness, hearts, friendship, and the search for a path home. The song was released as a single in 2002 and served as the game’s Japanese theme. For international releases, Utada recorded an English version titled “Simple and Clean,” rather than using a direct word-for-word translation as the commercial title.

The naming pattern continued in Kingdom Hearts II: its Japanese theme was “Passion,” while the English version was called “Sanctuary.” That difference can cause confusion because both “Passion” and “Sanctuary” are associated with Utada and Kingdom Hearts, but neither is the Japanese title of “Simple and Clean.” “Chikai” is another later Utada Kingdom Hearts song, associated with Kingdom Hearts III.