Chaos System formed by vocalists Kyouka (狂華) and Ben.
V: Kyouka V: Ben G:?? B:?? D:??
At some point in the mid-2000's, Chaos System has a pause in activities. All members other than Kyouka leave.
Chaos System revives with new members
V: Kyouka G: Tomo B: Rui
At some point, drummer TOMOKAZU joins
V: Kyouka G: Tomo B: Rui D: TOMOKAZU
Last live before going on "activity pause" a second time. chaos system has effectively disbanded.