Manga? Oh, you're definitely mixing up the medium here. The 'Warrior Cats' series by Erin Hunter is a very long-running book series—it's all novels, no official manga adaptation exists. Some fans do create incredible manga-style fan art, which might be where the confusion comes from. The core plot follows several generations of feral cats living in four Clans (ThunderClan, ShadowClan, etc.) in a forest and later by a lake. It's basically epic feline fantasy soap opera, with territorial battles, prophecies, forbidden romance, and chosen ones among the cats. It starts with 'Into the Wild', where a housecat named Rusty joins ThunderClan and becomes Firepaw, setting off decades of drama. The entire saga is about survival, leadership, and how the cats' warrior code both holds them together and tears them apart.
People get hooked because it's surprisingly dark and complex for a series about cats—characters die, alliances betray, and the mythology runs deep with StarClan and the Dark Forest. If you're looking for actual manga about cats, you'd want something like 'Chi's Sweet Home' or the cats in 'Fairy Tail', but for this particular sprawling narrative, you need to hit the books. The fan-made comics online are a cool bonus, though.