Chaos†System (カオスシステム) is formed by vocalist kyoka.
Vo: Kyouka, Vo: BEN, Gt: Taisuke, Ba: Takumi
Drummer KAZUKI joins.
Vo: Kyouka, Vo: BEN, Gt: Taisuke, Ba: Takumi, Dr: KAZUKI
Taisuke and Takumi secede.
Vo: Kyouka, Vo: BEN, Dr: KAZUKI
Vo: Kyouka, Vo: BEN, Gt: Yuki, Ba: Yuu, Dr: KAZUKI
Peformed at Jrock Connection 2005 in Santa Clara, California
BEN, Yuki and KAZUKI secede at some point.
Vo: Kyouka, Ba: Yuu
The band is back to activities with new members.
Vo: Kyouka, Gt: Makoto, Ba: Yuu, Dr: K
Vo: Kyouka Gt: TOMO, Dr: TOMOKAZU
Chaos System officially restarts activity.
Vo: Kyouka Gt: TOMO, Ba: RUI, Dr: TOMOKAZU
Self-sponsored event held.
Chaos System go on activity pause after their presents live