In a world divided between humans and katawara monsters, Tama, a katawara who adores humans, is determined to shield them from harm, even if it means clashing with her own kind. On the flip side, Tama's brother Jinka despises humans despite his own mixed heritage. Their trio is completed by Shinsuke, a timid swordsman seeking strength. When they stumble upon a sinister scheme to morph humans into monsters through experimentation, they pledge to take down the mastermind, even if it entails facing an entire army. Their journey unfolds with encounters of remarkable individuals, breathtaking locales, and epic battles against formidable foes.