Re:ZERO -Starting Life in Another World-, Chapter 3: Truth of Zero, Vol. 9 (manga)

Now you get to feel the terror of being crushed by someone three steps ahead of you! 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…