Tatsuhiko and Shofumi are hoodlums living in downtown Hawaii, having flown out of Japan and entered the country illegally for a reason. The two make a living by trafficking pakalolo – marijuana – under the pretext of selling tea leaves, but they are in a foreign land where they don't speak the language well. When they get busted by the chief of police, they're forced to make a deal and and help get a local crime boss masquerading as a benevolent celebrity arrested.
A private investigator who works when he wants, lives in a beachfront estate in Hawaii, drives a posh Ferrari, runs up an unlimited tab at a swank bar, and charms attractive women in peril - that's the lifestyle of Thomas Magnum, aka Magnum, P.I.