The first in what would become Toei's most successful, longest-running bosozoku film series. It lasted from 1968 till 1972 through sixteen films.

Kosaka Hiroshi is a small time swindler and the boss of a motorcycle gang in Shinjuku. Living only to make money, he never made the big time until he gets involved with a Yakuza's daughter. But when he gets involved in a scheme to blackmail a Yakuza gang and a land developer, he realizes he's gone way over his head…