Simple and Clean
Kingdom Hearts: Chain of Memories
Kingdom Hearts Birth by Sleep
Kingdom Hearts Re:coded
Kingdom Hearts 0.2 Birth By Sleep -A fragmentary passage-
Hikari is the original, Japanese version of "Simple and Clean"; it was originally released on Utada's Deep River album. It was used in the Japanese versions of Kingdom Hearts, Kingdom Hearts: Chain of Memories, Kingdom Hearts Birth by Sleep, and Kingdom Hearts Re:coded. The name Hikari (光) literally means Light in Japanese, a universal force in the Kingdom Hearts universe.
PLANiTb made remixes of both "Simple and Clean" and "Hikari". The PLANiTb version is faster, longer, and has more of a dance mix feel to it than Utada's original song. A shortened version of the remix is heard during the opening movie of Kingdom Hearts, Kingdom Hearts Final Mix, Kingdom Hearts Re:Chain of Memories, Kingdom Hearts Birth by Sleep, Kingdom Hearts Birth by Sleep Final Mix, and Kingdom Hearts Re:coded.
"Hikari -KINGDOM Orchestra Instrumental Version-" is an orchestral version of "Hikari", and can be heard in Kingdom Hearts and Kingdom Hearts Final Mix in the opening menu cinematic which appears if the player lets the opening menu sit for about fifteen seconds. The orchestrated version is also featured when Sora reads Kairi's letter in Kingdom Hearts II and at the end of each scenario of Kingdom Hearts Birth by Sleep. The orchestrated version is used during the opening movie of Kingdom Hearts 3D: Dream Drop Distance.
Simple and Clean - Ray of Hope MIX - is another remix of "Simple Clean" and "Hikari" that was used during the opening movie of Kingdom Hearts HD 2.8 Final Chapter Prologue. This version is shorter in length in comparison to the original and PLANiTb versions. "Ray of Hope" has a similar dance mix feel like PLANiTb, although a few clicks slower.
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