Kuro

Within the halls of an enormous mansion, live a girl and her black cat. They try to have oodles of fun each and every day, but ever since her kitty ran away, something's seemed a bit off...Still, with her trusty companion by her side, even if a bunch of strange, scary things are happening all around her, there's nothing to fear when Kuro is here!

(Source: Yen Press)

Note: Includes 12 extra chapters.