Once

 is the fifth single by Harada Hitomi. It was released on July 27, 2011, and peaked at #32 on the Oricon singles chart.

Single Information
Once was used as the opening theme for the anime Itsuka Tenma no Kuro Usagi.

Tracklist

 * 1) Once
 * 2) Kyuuai Real (求愛リアル)
 * 3) Once (off vocal)
 * 4) Kyuuai Real (求愛リアル) (off vocal)