"Digimon Adventure" was produced by Toei Animation and ran for 54 episodes on Fuji TV in Japan between March 7, 1999 and March 26, 2000. The main opening theme for all episodes aired in Japan is "Butter-Fly" by Kōji Wada, which peaked at #47 on the Oricon Weekly Singles Chart. "I Wish" by AiM is used as the ending theme from episodes 1–26, while "Keep On", AiM's 5th single, served as the ending theme from episodes 27–54. The series also uses three insert songs: "Brave Heart" by Ayumi Miyazaki as the Digivolution theme, "Seven" by Kōji Wada, and by Toshiko Fujita, Tai's voice actress. On August 1, 2014, during the series' 15th anniversary, a Blu-ray Disc box of the original series was announced and set for release in Japan on March 15, 2015.