So some time ago I watched this anime and now I would like to read the manga but I forgot ...

So some time ago I watched this anime and now I would like to read the manga but I forgot the title and a lot of the content.
What I remember: it was about a girl small like they sometimes gave her an actual human shape (the animators) but she was mostly a cinimonroll and she liked horror and then some ikemen came to, I dont know, make her more normal cause she was always indoors dark room and stuff she also had an organ skeleton thingy that she named, and it was in a mansion I think it was most a comedy anime.she had black hair and there might or might not have been something in her past that made her not want to show her face.