Two Hong-Kong cops are sent to Tokyo to catch an ex-cop who stole a large amount of money in diamonds. After one is captured by the Ninja-gang protecting the rogue cop, the other one gets his old Orphanage gang, dubbed the "Five Lucky Stars," to help him. They don't like this much, but they do it.
Muscles, cop from Hong Kong, is in Japan chasing a bad HK cop. His cop partner gets taken by the ninja gang. Muscles gets his 5 old no-good friends from the orphanage to help find the bad cop. Lots of comedy and kung-fu fighting follows.
