Re:ZERO Starting Life in Another World novel volume 25 was written by Tappei Nagatsuki with illustrations by Shinichirou Otsuka.

Subaru Natsuki is determined to make it through the Pleiades Watchtower without abandoning anyone, and he's willing to die as many times as it takes. Of course, he'll need more than just guts to save the day, and Subaru's still only one man. Luckily, his friends won't let him brave the challenges of the tower alone. As they gear up for the decisive moment, Subaru stumbles upon something that shouldn't exist—a book of the dead with his name on it. There's no telling what might lie in those pages, but not finding out could be even more dangerous…