In Hokkaido, it is rumored that there is a stash of hidden gold. This gold was supposedly stolen by a man who killed the original Ainu owners; and before being captured and imprisoned by the police, he hid it in a secret location. In order to relay the gold's location to his comrades on the outside, he tattooed the map on the bodies of his cellmates and promised them a share of the gold—provided they managed to escape and find it. In Golden Kamuy 2nd Season, First Lieutenant Tokushirou Tsurumi plans to give the 7th Division an advantage in the war for the tattoos by getting a taxidermist to create skins that only he can distinguish as fake. Meanwhile, Saichi "The Immortal" Sugimoto, Asirpa, and their companions continue their hunt for the skins by following a strange rumor: a thief who broke into a home in Yubari found taxidermied human corpses, among which was a torso with strange tattoos. [Written by MAL Rewrite]

Third season of Golden Kamuy.

This is a world of the skies, where many islands drift in the sky. A boy named Gran and a talking winged lizard named Vyrn lived in Zinkenstill, an island which yields mysteries. One day, they come across a girl named Lyria. Lyria had escaped from the Erste Empire, a military government that is trying to rule over this world using powerful military prowess. In order to escape from the Empire, Gran and Lyria head out into the vast skies, holding the letter Gran's father left behind—which said, "I will be waiting at Estalucia, Island of Stars." (Source: Aniplex of America)

On the run from the Erste Empire, Gran and the crew of the Grandcypher receive an offer to negotiate a ceasefire. Meeting at the neutral territory of Albion Citadel, they are welcomed and hosted by Vira Lillie: current Lord Commander of Albion and a friend of Katalina Alize from her officer training at Albion. Imperial General Furias grants the Skyfarers an official pardon, but fails to defuse the tense situation. Given time to unwind, the Skyfarers attend a gala hosted by Vira to celebrate the arrival of the crew. However, tensions run high, as Furias and the Erste delegation remain at Albion even after the negotiations conclude. Learning about the existence of a Primal Beast on the island, the crew is shocked to discover a letter from Katalina announcing her resignation. While Gran heads off to find their former comrade, Eugen and Rackam decide to investigate the Imperial presence on the island, suspecting a more sinister scheme lying up the Empire's sleeve. [Written by MAL Rewrite]