"Not if they don't know that it's aliens, de arimasu. We don't want to cause worldwide panic or anything, de arimasu. Besides, you guys are kind of ignorant in the ways of alien invaders, de arimasu."

The people he lived with before didn't even know that toothaches were caused by microscopic invaders.

"That's their weapon though, de arimasu. Not giving up, that is. I've always thought that was the reason why they've still been undefeated till now, de arimasu."