SEKAI / Wah Wah World / Gunjou Sanka(セカイ / ワーワーワールド / 群青讃歌) is a theme song single containing full versions of three commissioned songs along with their instrumentals. It was released on December 8, 2021 on CD and digital music platforms.
The first production of the single came with one of six Project SEKAI trading cards. B2-size posters were distributed on a first-come first-serve basis.
