Vocalist Aoi (葵) secedes. (before 2004-05)
Drummer NANA secedes.
Vocalist Jin (尽) and drummer MINAMI join.
Both line-ups of MASK hold one-day revival at Zepp Tokyo.
MASK were supposed to perform around this time, but was since postponed to the following year due to Gt.Michiru (未散)'s illness, which was so severe, he was comatose for three days.
MASK holds 15th anniversary live at Shibuya (渋谷) ON AIR EAST.