"20 Tsubu no Kokoro" (20粒のココロ?) is Rythem's eighth single. It was released on January 1, 2006 under Sony Music Entertainment Japan label. This single was only able to reach the #63 spot in the Oricon weekly charts.
The item's stock number is AICL-1664.
Read more about 20 Tsubu No Kokoro: Track Listing