The cephalopod cat that pretends to be Kajita's wig, Higuchi Yuuko's Gustave-kun, originally appeared in Kitty Tonight as art next to the proper 4koma - post #3057344. As such, I'm labeling this a crossover of sorts.
Updated
Mwahaha... I've finally obtained Kajita's body hair.I will mass produce Kajita clones based on these genes...And make them roll gacha over and over...!zaaapKajita-kun, did you change your hairstyle?Yet another... has angered the god of gacha... how foolish...What?Heya, Kajita!