Sexy Zone to release the 21st single. The title song is featured as the main theme song for the TV drama series "Kanojyo wa Kirei datta." The song is written by Motohiro Hata. This edition contains six tracks in total, including karaoke tracks. *B-side tracks corresponding to all the editions are partially different from each other. Includes a code to listen to tracks in the app "SZ10TH APP" (system requirements unknown).