Maneki Neko Jinja no Tenteko Mai na Hibi

After the company he established went bankrupt and he was left with nothing but the clothes on his back, Kazumi Iwakura comes to a small shrine at the far end of Tokyo to become its caretaker. However, upon arriving, he finds three cats who have called the shrine their home; a big, ugly ginger tabby and two furball-like gray kittens, one a gray-she and the other a gray-he.

As it turns out, they are bakeneko (cats that turned into youkai) and can change into human forms; the tabby into a handsome man with a death glare, and the two kittens into twins about three years of age...

(Source: Kadokawa, translated)