Apparently this is a comment from the final volume, at least that's what I got from another thread on a different site:
"Originally, it was supposed to be a manga about two characters exploring a world and encountering creatures and other hunters along the way. After consideration with my editor, the story changed. However, for this extra, I wanted to give readers a small taste of what the story initially was about. I hope it meets your expectations!"
If that's true then this is probably one of the worst choices by an editor in recent memory. In any case, I hope we get to see some scraped story ideas and designs in the last volume.