[Welp Raimei is just going to completely forget to answer the part about languages because she actually cares about the idea of secret keeping with a lot of verve. It's been a major aspect of her life that's baffled her. And now she's just going to work through her reasoning to herself out loud, almost forgetting he's even there.]

They're not unnecessary! [she says strongly.] Sometimes it's dangerous, or sometimes... it's so close to you that you don't want anyone else to know.

But I'm terrible at them. [She admits this forthright, slightly frowning.] I don't put enough thought into it. Anyway, I'm used to having to keep anything about the world of Nabari [the 'hidden world'] a secret, but that's what I'm guessing doesn't matter here.

You're not ninja, but I don't think any of you are civilians.