[He wants to listen to Roxas tell him these things. It helps the two of them get to know each other better. And while Izuku is still a little confused about all of this he has no reason to think that Roxas made any of it up. There's a lot of different people (and worlds) out there.]

I believe you, if it makes any difference. [He nods.]

We should try to head back to the ship soon, though. Would you like to keep talking about this another time?