In a world where monsters and humans coexist, Sasahara Natsuki, a struggling bounty hunter, navigates the delicate balance between the two. With a unique heritage of being part human and part cat-beast, she upholds the law, focusing on cases where monsters encroach on human rights. Alongside her hesitant admirer, a werewolf named Batanen, and other allies like Tommy the werewolf, Natsuki faces challenges enforcing justice. However, her loyalty is tested when a Kyubi fox demon named Sakura enters the scene with a sinister agenda to consume Natsuki and harness her magical potential by completing her nine tails.