| March 1 | Release of Blu-ray / DVD "L'Arc～en～Ciel LIVE 2015 L'ArCASINO" |
| March 29- | Starting day of "L'Access Stamp Rally" for L'mobile to commemorate "L'Arc～en～Ciel 25th L'Anniversary LIVE" |
| April 8, 9 | "25th L'Anniversary LIVE" First solo lives held in 1 year and 7 months and the 13th time to be held at Tokyo Dome which attracted 600,000 entries for ticket reservation Total audience of 110,000 for both days at the actual venue and live-viewing audience of 35,000 from 50 domestic theaters and 10 overseas locations, namely Hong Kong, Taiwan, Korea, Thailand, Indonesia, Mexico, Columbia, Costa Rica, Peru, Guatemala in total of 13 cities and 16 theaters Prior to the lives, special website featured "Mission: L'Arcollection" where songs can be collected to be played at the lives through "Mission: 1" Fan pieces can be collected in "Mission: 2" and L'Arc-en-Ciel history pieces around the world can be collected in "Mission: 3," as an original GPS game application in "L'Arcollection" |
| April 20 | Featured on NTV news program "NEWS ZERO" *Report about L'Arc～en～Ciel's "25th L'Anniversary LIVE during "SPOTLIGHT" |
| May 4 | Featured on WOWOW LIVE "L'Arc～en～Ciel × WOWOW "L'Anniversary" Special" *Airing of scenes from 15th and 20th anniversary lives |
| June 24 | Featured on WOWOW Prime "L'Arc～en～Ciel × WOWOW "L'Anniversary" Special" *Exclusive airing of 25th anniversary live along with documentary movie released in 2014 |
