In Re:zero with nothing but The breathing styles from Demon slayer

What would happen if you’re just living your ordinary life when suddenly you get Transported to a different world, but not just any world, but the world of Re:zero. A very dangerous and dark Isekai where the main character Subaru dies in so many brutal ways it would drive any ordinary person insane. And this is the very same world our protagonist Jasper Got thrown into and his only saving Grace is in the form of the Breathing styles from Demon Slayer and the Rokushiki from One Piece. and even with that the only thing he could say is ,“ I’m going to die in this cruel world aren’t I?”.