[That's a lot of information at once. So Nanjo is able to sense Personas? Everyone in his group, whoever that might be, can? Akira's never heard of anything like that (he certainly couldn't do it, with Akechi). So it's possible that their identities could be outed here without them even showing anyone.

It's troubling, but at least Nanjo doesn't seem to have done anything with the information.]

...My friends and I are wanted by the police in our world. I can't control them, but that's why I kept quiet.

[And it's unspoken that he would rather Nanjo keep quiet about it, as well.]

I couldn't be sure who here might not be so well meaning.