Acorn the Kitty Cat

Overview

I, Kitty Senior, enjoy my life as a house cat. When it's time to eat, my humans are there to serve me food. When it's time for play, my humans are there with toys. And when it's time to sleep, I have my very own human heater waiting for me in my futon, his name is Dear, A.K.A. Undies Man (don't ask, humans are weird). All is purrfect. Well, all was perfect... until Nekomaki decided to bring a little demon "cat" called Acorn into the house. I'm not even convinced that this ball of snotty fur even is a cat. I can already tell: my twelve years on this earth is NOT going to be peaceful... (Source: Manga Planet)

Source: AniList