| Kokoro Hitotsu | |
| Cover: | kokorohitotsu.jpg |
| Type: | single |
| Artist: | Misia |
| Album: | Mars & Roses |
| Released: | 27 August 2003 |
| Recorded: | 2003 |
| Genre: | R&B, J-Pop |
| Length: | 24:14 |
| Label: | Rhythmedia Tribe |
| Prev Title: | Back Blocks |
| Prev Year: | 2002 |
| Next Title: | In My Soul/Snow Song from Mars & Roses |
| Next Year: | 2003 |
is Misia's 12th single. It was released on August 27, 2003. It peaked at #7 selling 36,771 copies in its first week. The song served as theme song for the movie Dragon Head, starring Satoshi Tsumabuki and Sayaka.
| Release | Chart | Peak Position | Sales Total | Chart Run |
|---|---|---|---|---|
| August 27, 2003 | Oricon Daily Singles Chart | 5 | ||
| Oricon Weekly Singles Chart | 7 | 69,884 | 10 weeks | |
| Oricon Monthly Singles Chart | 14 | |||
| Oricon Yearly Singles Chart |