Nino is playing Fuu just like he read it in the book. Got it right in the beginning, then questioned himself but got back on track when she also admitted to trying to pull him in. It's cute and he thinks it's cute. But it looks way too obvious that he's using the experience to try to understand the game with Nino and others and guessing you'll see chapters Practicing with the other sisters... Miku, Yotsuba and Itsuki before he goee for the real match.