[He doesn't need to explain further. Honestly, this explains everything. It's not something he ever would have guessed, assuming from his own past experiences that Tsurumaru was definitely a demon of some kind, just something from outside his world.
It's a strange thing for him to voice, though, so he opts for:]
...Oh.
[Nailed it.]
I see. Is that why you're here today? To, ah, pay a visit?
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It's a strange thing for him to voice, though, so he opts for:]
...Oh.
[Nailed it.]
I see. Is that why you're here today? To, ah, pay a visit?