Milestone is BoA's first DVD single (31st overall) which was released on December 7, 2011 to commemorate her 10th anniversary in Japan. The song is written and composed by STY who was requested by Avex to write a song for BoA's 10th anniversary. The song was first performed at Audio Technica's 50th-anniversary live party, and later a 7-second snippet of the song live performance at J-Wave Live: Autumn was leaked.
