I like the decision to end this story on a hopeful note, after all the sadness before it. Everyone was likeable and I liked the various hints along the way.
I assumed that Nina would be treated badly by the people of Pocca for some reason. Even when the hero's brother found them, I assumed he'd accuse Nina of killing the party, or the villagers would kill her for engaging in black magic. I'm glad this was not the case, it would've spoiled the story.
Feels sad to see the party dead, but, at the same time, there's a reason for all those adventurers not making it back home. He's not the Demon Lord for no reason.
I skimmed through the pages for the first half because the lines are somewhat incomprehensible, then it got easier to read, then I know what the heck is actually happening and I felt the urge to give this a good rating.
@killua_15
Kimetsu No Yaiba's Author is called Gotouge Koyoharu, this is made by a dude that worked in a number of KnY side stories (Giyuu and Rengoku's gaiden mangas) and the Chibi Spin off. His only original works listed here are Boze oneshot, the short Bozebeats serialization (cancelled) and this one.