"I must not let anyone know I'm a human!"...
Yeah, good work on that. Father effectively already knows from your reactions, and should he ever know of his daughter's "manga" collection, would have more than enough proof. It's funny how they clearly both have more than enough reason to suspect the reality, yet they are missing each other's 'piece of the puzzle', so to speak.
Also doesn't help when the daughter has a crush on said human.