human
Subaru:  His black eyes widened in disbelief as he felt his throat tighten. He had discovered a deadly poison clearly meant for him that was harmless to everyone else. Natsuki Subaru’s book of the dead. This was a serious discovery.
gpt
Subaru:  "Why…?" Why was there a book of the dead that should not exist? The Taygeta archive in the Pleiades Watchtower was supposed to hold the books of people who were already dead. It made no sense to find the book of someone who was still alive. And he couldn’t pretend it belonged to someone who miraculously had the same name.
human
Subaru:  "It’s written in Japanese…" The title engraved on the black cover was unmistakably . As far as he had seen, the writing in this world was like nothing he knew. If Emilia or the others saw this book, it would look like meaningless characters to them. This book was a poison for Subaru and Subaru alone, but the opposite was also true. It contained a possibility only he could see. But a possibility for what, and provided by whom? The reason he found this book was because of Cor Leonis’s faint reaction and because he had searched based on that. Without it, he would never have noticed. It was a chance thing that was virtually impossible, barring the whims of a god.
gpt
Subaru:  "And if not a god, then…" Someone was behind this. Subaru was sure of that. The question was whether it was real. And if it was real, what would be recorded? Whose life would he experience?
human
Subaru:  "Was Natsuki Subaru considered dead the moment he lost his memories…? Does that make it a recording of all the times I died before…?" According to what Louis said, the corridors of memory extracted recollections and experiences from the souls of the dead before recycling the souls. If those memories were what filled the books of the dead, then it wasn’t hard to imagine how Subaru’s deaths might be reflected in some form or another. But in that case, returning by death is…
gpt
Subaru:  "What am I, stupid? Of course I’m stupid. And a coward…" Subaru berated himself as he felt his thoughts scramble in a completely unexpected direction. If he was being honest with himself, Subaru knew he was scared. What would happen if he read the book? He was terrified of that strange and unknown possibility. He was trying to put off testing his baseless hypothesis. To put off turning the pages.
human
Subaru:  "" It wasn’t like he particularly believed the five-minute hypothesis, but discovering that a book of the dead existed was almost a relief. It was essentially proof that he had not, in fact, just popped into existence. But at the same time, it also confirmed that another Natsuki Subaru really had lived in this world. And that he was wiping away the traces of that Subaru, overwriting him.