Tsubaki Sadamitsu, the leader of the Corpse Gang, is a troubled teenager who finds his life turned around when he meets an alien robot by chance. This fateful encounter thrusts him into a new mission: hunting down intergalactic criminals known as the Exiled Ones. Matters grow even more complex with the emergence of the Vulture, a failsafe system designed to keep the Exiled Ones in check.