| January | |
| 20 | Document photo book from live of 1998 "L'Arc～en～Ciel LIVE" release from Shueisha |
| Latter half | L'Arc～en～Ciel Official Goods Collection Second series on sale |
| February | |
| 20 | An all-shot in overseas photo book "L'Arc～en～Ciel LIFE" release from Shueisha |
| March | |
| 01 | Receive 36th Golden Arrow Awards Music Award Grand Prix! （TV Asahi Network） |
| 03 | Receive 13th THE JAPAN GOLD DISC AWARD（NHK） Single "Kasou" "HONEY" "snow drop" - receive Song of the Year! Album "HEART" - receive Rock Album of the Year! |
| 29 | "What is love" (included in the album "ark"）(Theme song for TBS Network "Express") |
| April | |
| 03 | Nippon Broadcasting System program "OH! DAIBA TO BLUE" Renewal start（25:50 - 15 minutes/ends in June） |
| 10- | Appeare on Suntory Can Coffee "Boss Seven" commercial series! （Following President Clinton, K-1, Takanohana） |
| 18 | Appear as live regular guest on TV Asahi Newtowrk "Inazuma! London Hearts" （Every Sunday 19:56-） 15th single "HEAVEN'S DRIVE" release *Oricon chart first appearance No.1 |
| June | |
| 02 | 16th single "Pieces" release *Oricon chart first appearance No.1 (Commercial image song for "SOTEC PC e-one") |
| 19- | "It's the end" Commercial image song for Playstation game "Grandia" （included in album "ray"） |
| July | |
| 01 | 6th album "ark", 7th album "ray" dual release （7 Asian countries release on the same day; Japan, Taiwan, Hong Kong, Malaysia, Singapore, Philippine!） （"ark"→#1 on Oricon album chart July 12th/19th two weeks in a row!） （"ray"→#2 on Oricon album chart July 12th/19th two weeks in a row!） Limited 62 days Special Website（http://www.arkray.com/） open! |
| Middle | Official band score "ark""ray" dual release |
| 17 | "1999 GRAND CROSS TOUR" starts from Osaka Cosmos Square special stage |
| 18 | Osaka Cosmos Square special stage |
| 24 | Fukuoka Marinoa |
| 25 | Fukuoka Marinoa |
| 31 | Appi Kogen special stage |
| August | |
| 01 | Appi Kogen special stage |
| 07 | Makomanai Open Stadium |
| 08 | Makomanai Open Stadium |
| 11 | 17th single "Driver's High" release *Oricon chart first appearance No.2 （Opening theme song for Fuji TV Network Anime "GTO"） VIDEO / DVD "CHRONICLE" release *Oricon chart first appearance No.1 "A PIECE OF REINCARNATION" "Heart ni hi wo tsukero!" release on DVD |
| 14 | Port Messe Nagoya special stage |
| 15 | Port Messe Nagoya special stage |
| 21 | Tokyo Bigsight parking lot special stage |
| 22 | Tokyo Bigsight parking lot special stage （6 venues, 12 performances / 650,000 people） |
| October | |
| 04 | TOKYO FM Network Yamada Hisashi no Radiunlimited "FLYING L'Arc ATTACK!" （Every Monday-Friday 22:20-22:30） |
| 16- | "LOVE FLIES" Theme song for TV Asahi Network drama"Aoi Tori Syndrome" "Ibara no namida"(included in album "ray") also used as the theme song for the drama |
| 25 | "LOVE FLIES" Commercial image song for Canon "Wonder BJ" |
| 27 | 18th single "LOVE FLIES" release *Oricon chart first appearance No.1 |
| November | |
| 20 | "trick" Commercial image song for TU-KA Celluar Tokyo / Tokai "EZ-web Tanjo Campagin" （Included in album "ray"） |
| December | |
| 01 | LIVE Video and DVD "1999 GRAND CROSS CONCLUSION" release |
| 07 | Receive Best Dresser Award 1999! |
| 31 | Countdown Live "RESET>>LIVE*000" at Tokyo Bigsight Higashitenjikan Hall （Live 35,000 people / Virtual Live 20,000 people） |
