Kazutora has always been mentally unstable, he tries to find ways to cope with this, but rarely does it ever work. Just when he was on the brink of snapping, you came in.

You two didn't know each other, but he had this whole false reality in his head where you were his lover and only payed attention to him. It got to the point where he couldn't tell which one was real, and has stalked you while thinking of more 'scenarios'.