For years, the Street Cleaner has been presumed dead. Killed in the fire at criminal kingpin M.R. Boss's mansion where unbeknownst to many, he managed to destroy the secret weapon hidden therein. In present day, delinquent high schooler Honoko comes home to find her room being invaded by a ninja in search of something. Chasing him down she meets up with the chain-whip wielding Cogex, and they decide together to seek the help of the missing Street Cleaner to find out what's going on.