JACK UP is formed in Tokyo (東京)東京.
Vo. K-ji, Gt. KEN, Ba. DAIGO, Dr. HAVA
JACK UP disbands.
JACK UP reunites. Vo. K-ji changes his alias to Vo. KOEDA, and Ba. DAIGO doesn't return. He is then replaced by Ba. KENJI.
Vo. KOEDA, Gt. KEN, Ba. KENJI, Dr. HAVA
Vo. KOEDA changes his alias once again to Vo. Hashimoto, and Ba. KENJI changes his alias to Ba. KEMU. At around the same time, Gt. Unkown joins, although it is unknown if this is a new alias of Gt. KEN, or just represents a lack of a guitarist.
Vo. Hashimoto, Gt. Unkown(?), Ba. KEMU, Dr. HAVA