If you liked the first season, though, you'll be totally satisfied. It continues from the end of the first season seamlessly--it feels more like a part 2 of a season than a totally different one.
The things I care most about are world building, music/sound, and character development. Airifureta excels at all three. The music and sound design is just as great as season 1. The opening theme isn't quite as good, but it was always going to be hard to beat "FLARE".
The world building is a more unique concept than most isekai--without going too into detail, it's more in line with Shield Hero in that all is not as it first appears.
What really drew me in, and continues to hold my attention, is the character growth that is a big focus. The first two episodes are all about Hajime's growth as a person, dealing with the loss of his friends, trying to wrap his head around one of them betraying him, and sacrificing pieces of himself (quite literally, some of the time) in order to survive.
It's classed as a "harem" anime, technically, and while there are elements of it (and plenty of fan service, if you're into that), the story holds up on its own. Personally, I find these moments to be more like a comedic or light hearted interlude, but I'm sure they would bother some people. It's not ecchi, but it's rated MA for a reason.
Overall, it's just FUN to watch. I've rewatched the first season more than once and I'll probably do it again at some point. Super pleased with season two so far!
