I'll begin by saying that I enjoyed the first season of Nanbaka. It wasn't brilliant, but it had a good amount of humor, and the art is very colorful.
The second season, however throws that all away (well, except for the color)
This season takes an incredibly dark tone shift, and it's really bizarre to see these goof-off clown characters thrown into a story as dark and edgy as an eighth-grader's fanfiction. The story seems like it wasn't planned out very well; the moment that finally shattered my hope for the series was when Upa's backstory was being explored and we learn that he had his organs stolen from him, and the one pharmacist guy was kind enough to give Upa his own organs. Both characters were alive years later, even though in my experience, people need organs to live. This was never explained further, not even in a hand-wavy sort of way.
The art is fine. It's just as colorful as the first season. At some point I started to resent how almost every character in the series can be considered a trap. I also started to hate their needlessly edgy designs, as almost every character has candy-colored hair and many have multiple piercings or tattoos.
Sound wasn't bad or good enough for me to notice. Although they did replace the opening theme with the same song sung by another guy who isn't as good.
The characters are all awful. Characters from the first season that were okay become edgier in stupid and convoluted ways, and become enjoyable to watch. I cannot think of a single character that I like, except maybe the cat.
I really hated this anime. At some point it became like some sort of punishment to watch, but I kept having hope that the lighthearted atmosphere of the first season would return. It doesn't.
