"The world is divided into two factions: humans and monsters called katawara. Despite being a katawara, Tama loves humans and vows to protect them from evil, even if it means fighting her own kind. Her stepbrother Jinka, however, hates humans, despite mostly being one. The siblings are joined by a cowardly swordsman named Shinsuke, who wants to learn how to become strong. After battling a group of monks who experiment on humans to turn them into monsters, Jinka has an assassin after him. With his powers, Jinka is confident he can't lose, but when the assassin challenges him to an ordinary sword fight, Jinka realizes he might actually be outmatched!"--Back cover.