The story (at least in the first few chapters I read) is about the adventure of the hero's party going back to the town after defeating the Demon King.

In the first few chapters it's shown as if the hero' party came back to their town after defeating the demon king. The went through snow, etc. Later we are shown that the hero' party is already dead and move as zombie of some sort. It's because they were already defeated and get killed by the demon king except the MC. The mc, is necromancer of some sort, then bring back their corpse to their home town. After that I haven't read any more chapter and forget to save. I just remember about this manga after watching some anime.