Golden Kamuy

They call him 'Immortal' because the guy survived the Russo-Japanese War so many times it became legend, and now he's broke, panning for gold in Hokkaido to pay for his dead friend's widow's eye surgery. Then a drunk guy tells him about a hidden Ainu gold fortune, and the map to it is tattooed across the bodies of escaped convicts. So now he has to find and decode human skin. It gets wilder. He teams up with Asirpa, a young Ainu hunter whose father was killed over the same gold, and the two of them form one of the best duos in anime — she's sharp, resourceful, and constantly trying to get him to eat animal brains. Meanwhile, a rogue military faction and a group of dangerous convicts are all racing for the same treasure, and every single one of them is unhinged in a memorable way. What makes this TV series hit different is the Ainu culture woven into everything — the food, the hunting, the language — treated with genuine respect and detail you don't see elsewhere. The tone swings between brutal violence and absurd comedy, sometimes in the same scene, and it somehow works. If you liked the historical edge of Drifters or the genre-blending energy of Samurai Champloo, this 12-episode first season from Geno Studio is right in that lane. Katanagatari fans will appreciate the treasure-hunt structure too. Based on a seinen manga, and it earns that demographic.