"Butter-fly" is a song originally performed by Koji Wada and featured as the opening theme for the popular anime series Digimon Adventure. The song was composed by the well-known Japanese musician and composer, Michihiko Ohta. Released in 1999, "Butter-fly" became a hit in Japan and gained international recognition due to its connection with the Digimon franchise. Interestingly, the song was inspired by a poem from the 17th century Japanese haiku poet, Matsuo Basho. The melody of "Butter-fly" has a catchy and upbeat feel, accompanied by lively instrumentals, which perfectly captures the adventurous spirit of the show. It remains a beloved song among Digimon fans worldwide.