I read all of it. It feels like it was cut a bit short at the end as we still hadn't been introduced to some of the sibling cats yet it suddenly ended after a grave visit and flashback from tonnura into many years ago. We never did find out exactly what he is either, just that his "race" is probably some kind of a supernatural creature with long lifespans, this wasn't mentioned directly but it was obvious from what was shown. Well, can't say it was really "revealed" as this was extremely obvious from the very start.
Anyway, the story itself isn't much. It's at most a cliché and generic slice-of-life manga. That is, unless we had this cat here. He and his siblings are the cores of this story. They're what makes it decent and a good read. Without them, this wouldn't be worth reading. The comedic value in this manga are mainly derived from the weirdness of the cats, like how the main one is pretty much a super "dandy" old man and does things you'd expect from such a person, another one is a "noble" type who likes arriving while riding his horse, yet another one is something of a brocon "idol", extremely crazy, then there's the mentally impaired ridiculously big youngest brother.
This sharp contrast to what a cat is supposed to be and be able to do makes it funny as this is simply not something cats are supposed to be able to do. Then there are also some weird quirks of theirs, like how they don't seem to be moving at all. They keep the same pose while moving, be it by jumping or flying. Oh, and the main cat pretty much makes all the girls around him literally orgasm from teasing them with his tail or just by how soft his fur must be when he "allows them" to touch him. Expect some ecchi fanservice pretty often, usually there's at least something every chapter. It's no big deal though.
If you like cats and the idea of weird supercats for some slight comedy, this is the manga for you. Give it a try and read the first chapter or preferable the first two chapters, that will give you a good idea about the rest of the manga as it will keep that style all the way through.
It's not even close to being my favorite, but it's a good read nonetheless.