"That just sounds troubling." He wouldn't know what to do about aliens, that seemed like it was above his paygrade. That seemed like an Amaterasu problem. "Can't say I've ever met a human with super powers so you may be onto something."

It sounds like one of those silly conspiracies one could find online, aliens coming in and blending among the humans. Yato isn't prepared for that outcome.

"Of course I'm going to worry about them, I could..." He paused. Actually, there was nothing he could do about it, was there? "Nevermind."