I have just one big problem with the first chapter...
The MC will start in that new world with top-tier gear. Even without his previous tamed beasts (then again, I don't know that, just speculating) it seems he still has access to his "storage", which means he has the magic super-sonic staff and cloud he just got from the last fight. Pretty sure that's enough to one-hit-kill a ton of low- and mid-tier enemies already. This removes a ton of the tension from the first steps.
And this kind of trick makes me doubt the "OP-ness" of the job itself.
Then again, they started the story with a first fight with him at high-level to establish how strong the class is, so this is a bit subverted.