KAT-TUN's new single "Yorokobi no Uta" features the theme song to the TV series "Tokkyu Tanaka 3 go" starring the member Koki Tanaka. Limited edition includes two songs, and comes with a bonus DVD with music video for "Yorokobi no Uta." *The DVD disc is encoded for region 2 (Japan, Europe, and Middle East), and no subtitles are included. *Jacket design differs from Regular Edition.