Gunbreaker, the anime. At least I do not remember any other anime with gunbreakers. Besides maybe some Final Fantasy adaptations, that is. At the least, it's not a isekai. At least not technically, due to how the transfer happens. Or is not a transfer? There were bits in the beginning that felt a bit boring, but I do understand why they had to be there, because those bits helped establish "normalcy" from protagonist's perspective. They definitely did not need to have a flash-forward in the very beginning, though, it did not add anything. I will give it a chance, but I already have a few ideas of how it may continue the story.
