Chiyome, born Mia, serves as a beastman ninja within the Jinshin Clan, an organization committed to freeing enslaved beastmen and combating systemic discrimination. Her clan’s legacy stems from their rescue by the first Hanzo, forging a centuries-long tradition of defiance against human exploitation. Upon demonstrating exceptional martial skill, she ascended to the rank of "Chiyome," a title bestowed upon the elite "Six Ninjas" tasked with covert operations. Her missions demand infiltration into human territories to gather intelligence and orchestrate daring rescues, executed with relentless focus.

She first crosses paths with the protagonist during a raid to liberate elves in Diento, offering crucial intelligence on human slavers. This alliance draws her into a coalition targeting the slave trade’s infrastructure, partnering with a cursed skeleton warrior and an elf soldier. Chiyome’s combat expertise blends agility with lethal precision, wielding katana and kunai alongside water-based ninjutsu. Her arsenal includes conjuring spectral water wolves for overwhelming assaults, generating deceptive clones, and the Bloody Needle technique—a ruthless maneuver that ruptures enemies from within by manipulating their bloodstream.

A pivotal shift occurs when she uncovers the skeleton warrior’s cursed visage, reacting with instinctive alarm before recognizing their shared purpose. Despite initial reservations, she pledges to his cause, valuing their collective objective above personal bias. Her unresolved personal quest involves tracking Sasuke, a missing mentor from her clan, whose fate remains shrouded.

Chiyome’s journey traces her evolution from a solitary agent to a strategic collaborator, navigating between her clan’s covert ethos and the exigencies of interspecies alliances. Interactions with allies expose a tactical mind tempered by empathy, notably when revising her skepticism toward non-beastman comrades. While entrenched in a wider struggle against oppressive empires and corrupt religious powers, her contributions remain rooted in espionage and frontline strikes against slavers, embodying her clan’s unyielding resolve.