Ark adalah album keenam yang dirilis oleh L'Arc-en-Ciel pada tanggal 1 Juli 1999, secara simultan dengan Ray.
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| 1. | "Forbidden Lover" | ken | 6:01 |
| 2. | "Heaven's Drive" | hyde | 4:15 |
| 3. | "Driver's High" | tetsu | 4:10 |
| 4. | "Cradle" | yukihiro | 4:56 |
| 5. | "Dive to Blue" | tetsu | 5:33 |
| 6. | "Larva" | yukihiro | 3:55 |
| 7. | "Butterfly's Sleep" | ken | 5:10 |
| 8. | "Perfect Blue" | tetsu | 3:48 |
| 9. | "Shinjitsu to Gensou to" (真実と幻想と) | ken | 5:22 |
| 10. | "What is Love" | tetsu | 4:13 |
| 11. | "Pieces (Ark Mix)" | tetsu | 5:45 |
Sekian, Semoga Bermanpaat..
