The anime is a big let-down. I would compare it as an adaptation as the same level of Gate. Incredibly toned down, to the level of family friendly. Not only that, but the story and pacing are also going in different direction.
With the manga having 13 volumes, and the LN being in some hiatus state, we can only hope for someone to pick the manga for translation.
I don't know for sure as I don't read light novels but I'm willing to bet the anime is a direct adaptation of the light novel and actually the manga made a load of improvements to the light novel.
There's a bunch of stuff in these 9 chapters that is so much better than what happens in the anime it's genuinely baffling the choices the anime made or it didn't just lift stuff like the design of the village, like the fact the head wound happens in the opening battle etc, the way the opening is structureed etc that is clearly just a lot better and it's bizzare it's not been used.
It wouldn't surprise me if there were even some rights issues involved meaning they cannot take the designs and stuff from the manga that isn't in the light novels and it's illustrations (the artist who did the LN illustrations and covers isn't the mangaka for the series and I think the mangaka is way better a lot of the designs have been subtly re-done and they are just better).
The anime is ok as far as mid range isekai go, it's more original than most etc but these 9 chapters of the manga are great and such a step above the anime (and I'm going to bet the light novel as well) that it's killing me there's no translation.