Man Against Man (1960)

Kikumori runs a cabaret on the docks, while his friend Kaji operates transport boats. When a gang of drug dealers tries to force the pair to cooperate in a smuggling scheme, conflict arises between the two friends. Falsely blamed for murder, Kikumori is blackmailed into an attempt to sabotage Kaji's boats and kill him. But the friendship between the two men proves an obstacle to the gangleader's plans.