**50th single release by SMAP. The title track was used as the theme song for the Japanese drama series, _Kasuka na Kanojo._** **Artist:** SMAP **Single:** Joy!! (Regular Edition) **Genre:** Pop **Release date:** June 05, 2013  **Tracklist** 01. Joy!! 02. Tenohira no Sekai (掌の世界; The World in my hand) 03. Joy!! (back track) 04. Tenohira no Sekai (back track)