It's just a cat being a cat, and somehow that's funnier than anything trying hard to be clever. Michael doesn't perform for you, he exists in the way actual cats exist, which means you're laughing at recognition, not jokes. The show trusts that watching a fat tabby navigate food, sleep, and mild chaos is enough, and it turns out it is.
Michael is a fat orange tabby who shares a home with a well-meaning but hopelessly dim pair of humans, and they happily believe he belongs to them. His days are full of small incidents and upsets: steering clear of Nyazilla, a fearsome local cat he knows he can never beat, begging food from nearby shops, spending time with his animal friends, and doing his best to keep his humans entertained. He also has a lively fantasy life, featuring cat corporations, cat nightclubs, and his own take on a dancing American superstar who shares his name. The comedy is adapted from Makoto Kobayashi's manga, which reviewers have praised for how funny and true to life its picture of cat behavior is.