Toei's most successful, longest-running bosozoku film series. It lasted from 1968 till 1972 through sixteen films.

Kosaka Hiroshi is the leader of a motorcycle gang in Shinjuku and a small time swindler. He lives for money but has never been able to hit the jackpot. His luck seems to change when he hits it off with the daughter of a Yakuza. When he gets involved in a scheme to blackmail a Yakuza gang and a land developer, he soon realizes he might have chewed more than he could bite.—Anonymous