CAN ANYONE PLZ TELL ME THIS ANIME OR MANGA I FEEL LIKE IM GOING CRAZY

I think there is a witch/immortal woman who falls in love with a human dude and she lives his whole life with him until he passes of old age. So she goes into a comatose state and a vampire finds her and drinks her blood. Then he starts falling for her and taking care of her but she doesn't react to him and he gets mad/frustrated. When the vampire takes on the physical appearance of her dead lover she finally 'wakes up' and says "what took you so long!" or sum shid.