In a world where monsters coexist with humans, Sasahara Natsuki makes a living as a bounty hunter. Her typical targets are monsters who have violated the rights of weaker humans, safeguarded by the law to balance the power dynamic. However, Natsuki's unique lineage complicates matters, being half-human and half cat-beast. She must navigate and appreciate both societal realms while enforcing justice. Accompanying her on her missions are Batanen, a timid werewolf secretly harboring feelings for her; Tommy, another werewolf; and Sakura, a Kyubi fox demon with a sinister motive of consuming Natsuki to acquire all her nine tails and unlock potent magical abilities.