Egao no Riyū./GIRIGIRI

Egao no Riyū./GIRIGIRI (笑顔の理由. ／ＧＩＲＩＧＩＲＩ) is a single release by Sonar Pocket containing the 1st opening theme of the World Trigger anime series. The single was released in 4 versions, 2 Limited CD+DVD Editions and 2 Regular CD Only Editions.

Limited Edition A CD Tracklist

 * 1) Egao no Riyū. (笑顔の理由. )
 * 2) GIRIGIRI
 * 3) Egao no Riyū. (instrumental) (笑顔の理由. )
 * 4) GIRIGIRI (instrumental)

Limited Edition A DVD Tracklist

 * 1) Egao no Riyū. Music Video (笑顔の理由. )
 * 2) Egao no Riyū. Music Video Making and Off Shoot (笑顔の理由. MVメイキング&オフショット)

Limited Edition B CD Tracklist

 * 1) GIRIGIRI
 * 2) Egao no Riyū. (笑顔の理由. )
 * 3) GIRIGIRI (TV size)
 * 4) GIRIGIRI (instrumental)
 * 5) Egao no Riyū. (instrumental) (笑顔の理由. )

Limited Edition B DVD Tracklist

 * 1) GIRIGIRI Music Video
 * 2) GIRIGIRI Music Video Making and Off Shoot (GIRIGIRI MVメイキング&オフショット)

Regular Edition A

 * 1) Egao no Riyū. (笑顔の理由. )
 * 2) GIRIGIRI
 * 3) Tanoshimase Tai!!! (タノシマセ隊！！！)
 * 4) Egao no Riyū. (instrumental) (笑顔の理由. )
 * 5) GIRIGIRI (instrumental)

Regular Edition B

 * 1) GIRIGIRI
 * 2) Egao no Riyū. (笑顔の理由. )
 * 3) Tanoshimase Tai!!! (タノシマセ隊！！！)
 * 4) GIRIGIRI (TV size)
 * 5) GIRIGIRI (instrumental)
 * 6) Egao no Riyū. (instrumental) (笑顔の理由. )