"Butter-Fly" was the theme song to the 1999 film Digimon Adventure,[1] performed as a ballad.

[2] Originally released on April 23, 1999,[1] the single was re-released on August 1, 2004 with new CD artwork to commemorate Digimon Adventure's 5th anniversary.

[10] The song was performed by AiM, Ayumi Miyazaki, and the eighteen main cast members of tri., along with posthumous archive audio of Wada.

[10][11] "Butter-Fly" was ranked number 5 on NHK's list of Top 100 Best Anime Songs in 2017.

[18] On September 2, 2019, Vocaloid Hatsune Miku released a cover, as part of a collaboration event with the Digimon franchise.