Rose looks between the oni and Nobunaga. Did he really just say that? She's surprised that the man's own familiar hasn't attacked him yet.

"You say they are not real, yet we are walking behind an actual oni right now. How do you explain Kimon's existence right now?"

She could understand if he came from a world without magic. That oni were just tales used to scare the gullible. But after being taken to another world, one has to at least acknowledge such things as magic exist. Especially when you are face to face with a fabled creature.