The first 100 chapters were total bliss. The action, the characters, the plot development, the fight scenes, the climax, it all worked so well together to make such an engaging story. Add on a harem ending at the end and it easily would have been one of the greats.
The next 50 or so chapters, up until the final arc, could not match, but were very good regardless, since they explored the life of the main cast living as normal girls. The tension in the previous arcs, especially with their need to find the drug to stay alive, was not present. But thats fine, their actions grant them a normal life to live.
The final 30 chapters went fine by themselves but bad compared to the rest of the story. Too many plot twists were thrown. Too many people died, more for the sake of them dying rather than any believable reason, such as Nanmi's persona. This memory limitation is brought up once and then never again, so its obvious this was done to get a cheap reaction from the reader. The final 10 chapters in particular went by too fast, the previous battle in the other climax went double the time, which paid off well. Had there been a final chapter with Ryouta getting a harem ending this could be forgiven, but all I get is a teaser, a great disappointment.
Messaging was heavy. The existence of higher beings, first witches, then aliens, then gods, makes one ask why humans mean anything in the first place. Especially Vingulf's plan of creating a New World, one free of the need of Gods, deals with the big questions in life. Did the author provide a good answer? Of course not lol. First, religious belief, as opposed to general belief, was poorly defined. Second, its not clear how these new, irreligious humans will be any better than the old. I'd say they're much worse, given all these new humans I saw were genocidal freaks. Last, the villians die in the end anyways so the author doesn't agree with their own thesis, namely that humanity is better when unbound from religious belief. Regardless, this is just 30 chapters, much of the story is better than the second climax, which by itself is still good.
Art though did improve over time, good on the author. If this existed in English paperback I'd buy it, but alas Western publishers once again disappoint me.
9/10.