on July 1, 1999. Despite peaking at number 47, "Eternal Memories" has since become Crystal Kay's eighth best-selling single. 1999 saw the release of two more singles, "Teenage Universe (Chewing Gum Baby)" on September 8 and "Komichi no Hana" on November 3, the former peaking at number 47 and the latter at number 80. Crystal Kay's first studio album, C.L.L Crystal Lover Light was released on March 23, 2000. This album is noted by fans to have a more indie and acoustic feel as opposed to her later albums which mainly come under the genres of pop and R&B. Crystal Kay was only 14 years old when this album was released. C.L.L Crystal Lover Light debuted at number 60 on the Oricon charts. A fourth single was released on the same day as C.L.L Crystal Lover Light, "Shadows of Desire". Because of its release date it became Crystal Kay's first single to fail to chart. "Shadows of Desire" was Crystal Kay's first A-side to be sung entirely in English. After a year-long period of inactivity, Crystal Kay returned to the music scene with the single "Lost Child". The single, which was a collaboration with Shinichi Osawa and Hiroshi Fujiwara was released on February 15, 2001, and reached number 55 on its debut week. Despite Crystal Kay only being credited as a featured artist on the song, it was still featured on her next album, 637: Always and Forever. Her fifth single "Girl's Night" came three months later on May 9, 2001. The single saw the introduction of urban influences in Crystal Kay's music. Despite this new style, the single peaked at number 100. One of the b-sides, "Make Me Whole" was a cover of the Amel Larrieux song of the same name. Crystal Kay's next single, "Ex-Boyfriend", was released on July 4, 2001. It featured rapper Verbal of M-Flo. The single was a success for Crystal Kay, peaking at number 44, and became her best selling single at the time of its release. Crystal Kay released her sophomore effort on August 22, 2001, 637: Always and Forever. The album became Crystal Kay's first album to reach the top twenty of the Oricon chart when it debuted at number 19, and sold 15,640 copies in its first week. Crystal Kay finished off 2001 with her seventh single, "Think of U", released on November 28, 2001. The single was Christmas-themed. It debuted