- 2001-09-00 ArcAdiA forms.
- 2001-09-00 【lineup】 V. Ayumi / G. kazu / G. NAO / B. Seiji (静時) / D. Yuu
- 2001-10-00 Saigo no Yoru released.
- 2001-12-00 ArcAdiA joins Matina sublabel STORM.
- 2002-10-30 PRELUDE:IV ~an illusion of iridescent~ released.
- 2002-12-00 Guitarist NAO and drummer Yuu secede.
- 2002-12-03 Matina Fair Vol.4 Special Message Disc released.
- 2002-12-25 「Irony」 released.
- 2003-00-00 Guitarist kazu secedes. (Date unknown; kazu was still a member in April 2003, but seems to have seceded some time after that.)
- 2003-00-00 Guitarist YUTO (ユト) and drummer Mitsuru (みつる) join. (Dates unknown.)
- 2003-02-08 Risoukyou 4th STAGE released.
- 2003-02-08 Sponsored event, Risoukyou 4th STAGE (理想郷 4th STAGE), is held at Sapporo (札幌) MESSE HALL. (Presumably, 1st STAGE, 2nd STAGE, and 3rd STAGE were held some time before this.)
- 2003-08-07 Oneman live is held at Sapporo (札幌) MESSE HALL.
- 2003-11-15 Oneman live is held somewhere. Drummer Mitsuru (みつる) secedes.
- 2004-01-00 ArcAdiA indefinitely pauses activities.
- 2004-05-03 ArcAdiA officially announces disbandment via their OHP.
- 2004-05-03 ArcAdiA disbands