The Saeki's Black Cat

Haruka Saeki is an office lady at a black company. One day, when she comes home after working for 45 consecutive days, she discovers that her cat, Kikuchiyo, has turned into a human(?)!? And so Kikuchiyo tries to take care of Haruka, but... Then, one after another, other human(?) cats join in!?

How about a stylish black cat for your daily fatigue? Handsome black cat x black company office lady. A lively♪ and fluffy black cat comedy!

(Source: Akita Shoten, translated)