Their problems are being resolved by a third party off screen, while they are litteraly just standing there doing nothing and being confused since they didn't know why the villain randomly got their comeuppance. Imagine if in romeo and juliet a random stranger threaten both of their families to reconcile so they can marry and living happily ever after while they know nothing of it. It's baffling.
On the second arc after that it's become completely dry, the author introduces new characters but they're not as interesting as the characters from the first arc and the author seems trying too hard to prevent the MC doing something exciting. The author repeatedly makes the MC refuse anything that seems will be exciting since he want to laze around, which makes him looks like a slob... (In the first arc it's barely mentioned but on the second arc it's often mentioned as if to remind the readers to not expect him doing something, which makes it feels irritating instead)