"Endless sorrow" is the 22nd single released by Ayumi Hamasaki on May 16, 2001. It is also found on her I am... album. The version featured on the single is vastly different from "Endless sorrow (gone with the wind version)", featured on the album; the album version with a generally more mellow, calmer sound. The single version features dramatic strings, piano, and rock leanings. The album version also contains a hidden track, "Flower Garden", with several minutes separating "Endless Sorrow" and the hidden track.