This looks like potentially a super-interesting manga, so long as the author doesn't cheat-skill his way to victory the way most Isekai-mangaka do. He has a solid recipe for success with the first 3 chapters, if he properly builds out the characters in the new territory in interesting ways this could be an absolute banger. I already like this at about an 8-9, but I changed it to 10 just off the potential. Definitely check this manga out. A rather more nuance take on the fantasy/isekai genre than most of the hacks trying to do this genre have, even if it isn't strictly an isekai. It kind of feels like he thought up a good scenario for an isekai, but then thought about it some more, and said to himself 'does the MC actually need to be from a different world?', realized that he didn't, and that actually makes it more interesting and real-feeling.
I would recommend at least trying out the first 3 chapters.