Koharu Hoen commands the Monster Development Department for Black Lore, a corporation notorious for exploitative labor practices and employee welfare neglect. Her career traces back to an academic partnership with Dr. Hajime Sadamaki, Agastia’s Monster Development leader, now transformed into a fierce rivalry as she relentlessly pursues dominance over his legacy. This competition extends beyond personal ambition, reflecting the ideological clash between Black Lore’s cutthroat corporate philosophy and Agastia’s comparatively worker-centric approach.

Tasked with engineering monsters for her organization, Koharu champions ruthless efficiency and aggressive cost-cutting, prioritizing corporate interests over ethical concerns. Her catgirl assistant, Elbakki, routinely lightens inter-organizational tensions by playfully taunting Agastia’s Wolf Bete during cross-company encounters.