The Deer King(2021)

Shika no Ou: Yuna to Yakusoku no Tabi

Van resolves to fight the Zol Empire and save his homeland, only to be captured and sent to the salt mines. Then one night, a pack of wild dogs attacks the mine, trailing a mysterious and deadly disease in their wake. Van and a young girl named Yuna are the sole survivors of the disaster. But why? And where do they go from here?

(Source: Yen Press)