[It's mostly American history! Nagisa doesn't know a lot about that, for obvious reasons. There's a particular bias for World War II. ...There might also be a raunchy romance novel tucked somewhere between the roaring '20s and the Great Depression. Nagisa jumps just a little when Hibiki speaks up; he was so focused he didn't notice the other approaching.]

Ah... Not really, I'm just reading for fun.