In the early twentieth century, Russo-Japanese War veteran Saichi Sugimoto searches the wilderness of Hokkaido for a hoard of hidden gold. With only a cryptic map and a native Ainu girl to help him, Saichi must also deal with every murderous cutthroat, bandit and rogue who knows about the treasure!

Sugimoto and Asirpa (and Shiraishi too) have been reunited and head south across Karafuto with the goal of returning to Hokkaido. But after so much time apart and all that has happened, Asirpa's feelings about the Ainu struggle have changed. Meanwhile, Lieutenant Tsurumi begins trying to decipher the code in the tattooed skins and sends a double agent into Hijikata's group. But Hijikata is no fool, and engages in a battle of wits with Tsurumi. Regardless of who comes out on top, it is clear that only Asirpa holds the key to finding the Ainu gold.