[He doesn't want to know, and Sousei doesn't want to tell him--so he's glad that Souji doesn't ask. It is why he knows about Souji's illness, but... he keeps that to himself as well.

But Souji is also the first to have actually...well, asked what sorts of threats. He supposes he shouldn't be surprised; Souji did his own protecting of their country, so naturally he'd still be concerned with it. But even so, Sousei can't exactly say "we protect the country from evil malevolent giant snake spirits and the like".

Yeah. Not that, quite yet. He doesn't miss a beat.]

From whatever may pose a threat to the citizens, truly. Civilians, especially. There is the police as well, naturally, but we handle greater threats that they cannot take care of.

[So sometimes serial killers, sometimes orochis, you know how it goes.]