637 -always and forever-
Crystal Kay
Songs
| Song | Plays | Release Date | Duration | |
|---|---|---|---|---|
| 01 | Girl’s Night | 0 | May 9, 2001 | May 9, 2001 — |
| 02 | interlude～my ex | 0 | — | — 00:27 |
| 03 | Ex-Boyfriend | 0 | July 4, 2001 | July 4, 2001 — |
| 04 | CURIOUS | 0 | August 22, 2001 | August 22, 2001 — |
| 05 | He Will Be Mine | 0 | — | — — |
| 06 | Another Best Thing | 0 | — | — — |
| 07 | Guardian Angel | 0 | — | — — |
| 08 | interlude～conditioner | 0 | — | — — |
| 09 | Honey Glue | 0 | August 22, 2001 | August 22, 2001 — |
| 10 | 月のない夜 道のない場所 (Tsuki no Nai Yoru Michi no Nai Basho) | 0 | August 22, 2001 | August 22, 2001 — |
| 11 | Holiday Fighter | 0 | August 22, 2001 | August 22, 2001 — |
| 12 | Couldn’t Care Less | 0 | — | — — |
| 13 | LOST CHILD | 0 | February 15, 2001 | February 15, 2001 — |
