Butter-Fly
1999 single by Kōji Wada
"Butter-Fly" is a song recorded by Japanese singer Kōji Wada as the opening theme song to Digimon Adventure. The song was released as Wada's debut single on April 23, 1999.
Background and release
"Butter-Fly" was the theme song to the 1999 film Digimon Adventure, performed as a ballad. "Butter-Fly" was later re-worked as a rock song, and its rock iteration became the opening theme song to the television series of the same name. It had been the first time Wada had performed a rock song.
Originally released on April 23, 1999, the single was re-released on August 1, 2004 with new CD artwork to commemorate Digimon Adventure's 5th anniversary. The success of the song gave Wada the title "Immortal Butterfly Anime Song Singer."
Other versions
"Butter-Fly (Strong Version)" was released on April 22, 2009 to commemorate the 10th anniversary of the Digimon franchise as well as the 10th anniversary of his debut with the song. It was his first single in three years after "Hirari" and charted on Oricon Weekly Singles for one week.
"Butter-Fly (tri. Version)" was released on November 25, 2015 as the theme song for the Japanese version of the anime film series Digimon Adventure tri., and the single was his last release before his death on April 3, 2016.
This brief starts where responsible research should: with the source description of “Butter-Fly” as 1999 single by Kōji Wada. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the general reference register because the source frames it as 1999 single by Kōji Wada. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Aug 30, 2026. The linked authority identifier is Q2928980. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1999, 2004, 2009 and 2015.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Butter-Fly” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.