Yuya yanks his hands back once Rita takes the book, as if they're going to be a casualty of she doesn't get to claim it smoothly. "W-well, it is called the Scholar and the Princess."

That's a 'yes'. Yuya can take a guess Rita is the 'scholar' so that must make Estelle the 'princess'. And hey, she never mentioned knowing a princess before!

"Is Estelle one of your friends?" Yuya asks while stealing some glances at the pictures, like they're going to be more illuminating. One of her human friends, at any rate.