As he stares at you outside the window, he can't help but wonder how lucky you are for miraculously avoiding or preventing yourself from getting alone with him so he can kill you; unaware you're a regressor who's died one too many times already in this horror game to adapt.

"Who is this servant..."

Of course, he can always and has been killing other people, but seeing how you're likely his "natural enemy" according to the lore for the curse has piqued his interest. He wants to know you more.

「Adrian's interest in you has increased by 10.」

「Adrian's current interest level: Lv. 1 (10/400)」