The setting of literary giant's wild dog book

The story of Wild Dog of Literati is set in Yokohama, Japan, and the plot is set in the contradiction between the port mafia and the armed detective agency. Nakajima Atsushi, the hero of our story, was bullied all the time because of his big appetite, and was finally driven away. Nakajima Atsushi, penniless, wandered around at a loss and accidentally discovered the massacre of suicide by jumping into the river. After saving him out of kindness, I learned that he was a member of the "Armed Detective Agency", and together with his partner Guo, I searched for the white tiger that had caused trouble frequently recently. What I didn't expect, however, was that all this was not an accidental meeting but a deliberate arrangement by Osamu Dazai, and Nakajima Atsushi himself was a white tiger, but he didn't know it. Finally, at the invitation of Osamu Dazai, Nakajima Atsushi chose to join the Armed Detective Agency.