I read the manga way before the show came out, and it was really good, then season 1 of the show came out and I was excited, it feels so rushed and changes a lot of what made the manga good. However i started watching season 2 and it is one of the worst things I've ever watched. The main character is even more of a loser than in season 1 and the stupid scenarios that they keep shoving out just ruins it. And they again changed it so its nothing like the original story, where its like a crappy fan made spin off. They basically made season 1 for young teens, and season 2 for toddlers because they are the only ones who could find any of it funny.
Don't waste your time on it, just stick with the manga or watch literally anything else.