Brave Dan

In the untamed wilderness of Hokkaido, the Ainu people maintain a harmonious existence with nature. Young Kotan Nakamura lives a tranquil life until he encounters Dan, a tiger that has escaped from a train transporting it to a zoo. Together, they uncover mysterious subterranean ruins where they meet an elderly man named Upopo, who reveals the existence of three keys leading to a legendary treasure. Their discovery is interrupted when the villainous Sekkoku Kou, also seeking the treasure, fatally shoots Upopo. With his dying breath, Upopo entrusts one of the keys to Kotan. Now, Kotan and Dan are thrust into a perilous conflict as multiple adversaries pursue them in a ruthless quest to obtain all three keys and claim the hidden treasure.