Re:ZERO - Starting Life in Another World: Chapter 3: Truth of Zero - Volume 9 | Daichi Matsuse, Tappei Nagatsuki

Once more, the Mathers domain is the stage for conflict, and Subaru goes there to strike down Petelgeuse, his mortal foe. But Petelgeuse is a formidable adversary thanks to his mysterious link with the Witch Cult agents he calls "fingers." And just as victory seems close at hand-as does a reunion with Emilia-a disturbing change befalls Subaru's body...