The discography of Japanese contemporary R&B singer Crystal Kay consists of 12 studio albums, two extended plays, five compilation albums, four video albums and numerous single releases. Crystal Kay debuted as a singer at 13 years of age in 1999 under Epic Records Japan. Her third album Almost Seventeen (2002) saw a great leap in popularity for Crystal Kay, reaching number two on Oricon's albums chart. In 2005, Cyrystal Kay sung the eponymous theme song for the Tsuyoshi Kusanagi drama Koi ni Ochitara: Boku no Seikō no Himitsu. "Koi ni Ochitara" became Crystal Kay's most successful single, being certified for a million ringtone downloads.