At first, I thought this was interesting. It took a dark turn the second the story started and made it seem like it was very grave. The fight scenes were neat, and it eventually became your standard isekai where the protagonist is just training which isn't bad.
However, it's slowly starting to take a nosedive. The harem part is getting annoying, and the conflict between characters is just turning into a power-fest of sorts where they just pit strong antagonists against the protagonist continuously to pretend to progress in the story.