Friendship between good samurais and aborigines in Hokkaido.

Koichi Haruyama, who works at the Morita Automobile Factory, was driving a convertible through Ginza in search of accident sites. He buys cars that have been damaged in accidents at a low price and scraps them for his own company. He uses the money he earns in this way to pay back Kanda Trading. Morita, the president of the company, is suspicious about the identity of Kanda Trading, from whom he borrowed money. However, what is borrowed must be repaid, and Koichi drives to Toyokawa to beg his grandfather for money as his scrap business is not going well. In addition to begging for money, Koichi has another secret purpose...

One day, a lone horseman rides into town with a wounded man strapped behind him. Joe, the Ace, had captured one of the bandits who had held up the armored payroll car headed for the dam construction site, takes the wounded man to the police and claims the reward offered. He is told to wait until the driver of the armored car returns to identify the bandit and goes over to the Blue Star where he is introduced to Mishima, the owner of the cabaret, who is highly respected in the town. Joe then meets Saburo, while fishing, and his lovely sister, who seem to sense the real man beneath the rough appearance and take him into their home. Word reaches Joe that the bandit he'd captured had been shot and he hurries over to the hospital.

A love triangle develops between a benevolent student, his innocent girlfriend, and a cruel petty criminal, all as a point of diagnosis of a social disease that had Japan slowly succumbing to lawlessness during the post-War era.

Second sequel to "Story of Second Class Private".