Do we have any official information about the axe?
We're still not saved from it, imho. The previous loop felt rushed at the end, and the manga could still end in 2-3 chapters via some ellipsis.
Also, I found it quite incoherent that the village elder knew about Fiona and her brother. Why not tell the government in order to imprison the demon king before he reincarnates? Or even just kill him straight from the start without needing a Hero?