Sugimoto Saichi, called "Immortal Saichi" for his incredible powers of survival, is panning for gold in the far north when he hears a story about buried treasure, hidden by a death row inmate. He decides to go after the treasure, but it will be a journey far longer and far more dangerous than he'd ever imagined.

Asirpa takes Sugimoto through the Hokkaido forests, where they encounter a bear in its den. Sugimoto is impressed by Asirpa's knowledge of the land. Meanwhile, another, older force is after the gold..