"I can't leave her behind in a place like this." What worth has her behind to you, hmm? O_O
This first chapter has nothing. Isekai manga normally explain and justify theirselves in the first chapter, which I think defines "Isekai" as a stereotype. In lacking that this manga is refreshing. But it merely removed Isekai's hook, failing to replace it. This first chapter needed more exposition. Not written or explained, but shown through course of the crypt. Why is the crypt to bright? There is a lack of shading on each page, the candles are like rocket engines. Why is the crypt so clean? There is a lack of texturing on the walls (Where is the noble cobweb? And the humble clump of dirt?) or at least the different pov of each panel fails to express the crypt. Maybe the crypt really is supposed to be clean? Why do the walls change from plain unplaned stone to brick? Where does this change occur? Why were there so many buckets beside the fountain if there are only undead lumbering about?
But now our protagonist is out of the crypt and into the woods, so the appearance (which makes the difference between manga a short story [or "LN") was just a facade. Even if you don't bother with its textual lore, Exanima did the same thing but better. Another user mentioned DaSIII. Could you imagine if the Undead Asylum of Dark Souls 1 was unnamed, unlored, and without the tutorial boss? That's what happened here, except you don't get to enjoy being the protagonist.