He's noticed her before, of course. Vergil is too hypervigilant about his surroundings not to be aware of the people as well, and neighbors are surely among those that he's going to notice sooner rather than later by virtue of their proximity alone. But they've never held any sort of meaningful conversation with one another, which Vergil knows for certain on his part has been by choice. He avoids conversation wherever it's possible, and the notion of just walking up to anyone, neighbors especially, and striking a conversation makes his skin crawl uncomfortably. Even the allure of generating more Lore that could bring him closer to obtaining the Yamato once more isn't nearly enough of an incentive to push past his dislike of inane conversation.

But given that she is a neighbor, it was perhaps inevitable that, at some point, conversation would be had one way or another.

He puts out a quick hand to stop the door from swinging fully open and smacking him directly in the face, protectively pulling the small stack of books closer to his chest.

"Careful," he says, only intending a slight admonishment but perhaps conveying more than intended between his expression and tone.