With the way the series seems to be going I'd say it's all downhill from here. The story is getting progressively worse, I feel as if the author doesn't have a plan for the story and is just making it up as he goes along. This whole new leveling process the author is doing by allowing the MC to gain levels and skills from killing people is a terrible idea. They should have stuck with the "All You Need Is Kill" style of getting stronger. You have a character that can groundhog day, why are you introducing this bullsh*t because you're wasting an opportunity with your premise. Characters that get stronger through hard work and perseverance will always trump characters that are just given the Gary Stu token.
Can't get invested in any characters because the author will just abruptly abandon or kill them off to repeat the same process over and over again. These "unique character quests" irk me the wrong way as well, why introduce them if you're never going to bother completing them or changing the conditions half-way through. Like the 2nd female companion that was introduced, the author made the point to establish that she cannot be trusted no matter how far along you get with your companionship stat (or whatever terminology was used) only for that caveat to be completely forgotten about later. And the way he just abandons her? Seriously? I think it would be a very good idea to explain everything that's going on and that slime guy and co. are dangerous and shouldn't be trusted, but no, of course not, that would be the sensible thing to do. I couldn't possibly imagine a scenario where withholding such important information would result in jeopardizing her life and ultimately making your decision to keep her out of harms way utterly useless /s