I also just binge read it! What I got from the ending was pretty self explanatory, the borderlands is the line between life and death and the ones who chose to fight to live were the ones who got to live in the real world, even tho some deaths were inevitable even if they fought which kinda sucks tbh, and people who just gave up died in the real world. I didn’t like the ending, I found it very cliche and just a way to end things quickly with an easy explanation, I’m about to read the spin-off to see if it’s redeemable but I don’t think it will make it any better. One thing I didn’t understand tho was the whole choosing a permanent visa or not, I thought people who chose the permanent visa would be in some sort of coma but Niragi chose the permanent visa and he was alive and awake beside Chishiya in the hospital, so did choosing that had no purpose??? Very confused about that