Best way to start an Isekai: truck-kun
Worst way to end an Isekai: Axe-kun
Well, it was "ok". Not something I was waiting every month, but i would still read it anyways.
1. The manga is meant to be just a promotion for the novel.
2. The manga was axed.
3. The author ran out of ideas on how to continue this story and as such he wrapped up the story in a few chapters.