Shinpei Hidoro is the son of the Hidoro Family.

In the early twentieth century, Russo-Japanese War veteran Saichi “Immortal” Sugimoto scratches out a meager existence during the postwar gold rush in the wilderness of Hokkaido. When he stumbles across a map to a fortune in hidden Ainu gold, he sets off on a treacherous quest to find it. But Sugimoto is not the only interested party, and everyone who knows about the gold will kill to possess it! Faced with the harsh conditions of the northern wilderness, ruthless criminals and rogue Japanese soldiers, Sugimoto will need all his skills and luck—and the help of an Ainu girl named Asirpa—to survive.
 
(Source: Viz Media)
 
Note: Won the 9th Manga Taisho Award in 2016 and the 22nd Tezuka Osamu Cultural Prize in 2018. Nominated for the 20th and 21st Tezuka Osamu Cultural Prize and the 40th Kodansha Manga Awards in 2016.

In the early twentieth century, Russo-Japanese War veteran Saichi “Immortal” Sugimoto scratches out a meager existence during the postwar gold rush in the wilderness of Hokkaido. When he stumbles across a map to a fortune in hidden Ainu gold, he sets off on a treacherous quest to find it. But Sugimoto is not the only interested party, and everyone who knows about the gold will kill to possess it! Faced with the harsh conditions of the northern wilderness, ruthless criminals and rogue Japanese soldiers, Sugimoto will need all his skills and luck—and the help of an Ainu girl named Asirpa—to survive. 

(Source: Viz Media)

Bundled with the 15th volume of the Golden Kamuy manga. 

"Barato no Ugou" (Showdown in Barato) depicts the battle in Barato. Hijikata and Nagakura sides with the Hidoro clan and get information about the tattoed convicts in the city. On the other hand, Ogata joins Kusuda Umakichi and threatens the police chief to join his cause.