Yaminabe: Senryouka Nihon Haizanhei Monogatari

The year is Showa 21 (1946). In the aftermath of the war, the wounded soldier Ichishi Takamura, known as the "Mad Dog," is recruited by Okamoto Unosuke, the leader of a new organization known as the Nagato Trading Company. Once again, he is thrown into battle, this time as a "guard dog" protecting illicit funds...

Founded by formidable ex-naval officers, Nagato Trading Company's mission is to recover the treasures lost during the war. As the newest member of the company, can Takamura, a former army man, earn their trust and accomplish his missions!? The lone soldier will fight on, with the memories of his dead wife and comrades in his heart!!

(Source: Nihonbungeisha, translated)