Kimura wins a trip to Hong Kong, but once he arrives, he is mistaken as a hitman and is assigned to kill Yumiko, the female successor to the Ota Group conglomerate. When Kimura falls for his target instead, he must learn kung-fu from a local (Yuen) to fight off the yakuza assassin "Invincible" assigned to finish the job.
Naomi Shimizu is a young career woman working for Enrico Dandolo, an Italian fashion house. That is until one day the company declares bankruptcy. Accustomed to living in luxury she tries to make a run for it with the last remaining company asset, a red Alpha Romeo sports car. Unfortunately she recklessly collides with an bicycle messenger. Lacking any funds to pay for a settlement, she end up having to work as a bicycle messenger.
Chunba and Kotetsu, grows up in the working class neighborhood of Kishiwada in Osaka in the mid-seventies. Their life in school is a never-ending series of fights and reprisals against rival gangs landing them in trouble with organised crime and in the juvenile court.
