Mayumi Karasugawa is a high-ranking operative within the criminal organization Panther Claw, serving as the head of recruitment. She operates under the cover of a teacher at Hamaguri Academy, an elite private school, where she identifies and grooms potential new members for the organization. Her methods are cruel and sadistic; she derives intense pleasure from torturing and breaking her students, conditioning them into loyal Panther Claw soldiers through pain and psychological manipulation.

Personality and motivations: Karasugawa is a confirmed sadist and a lesbian who makes aggressive, unwelcome advances toward the girls in her charge. She is instantly attracted to both Honey Kisaragi and Miki Saotome upon seeing them, and she develops an obsessive fixation on Miki in particular. Her primary motivation is service to Panther Claw, but her personal gratifications—control, domination, and inflicting suffering—often overshadow her organizational duties. She is cunning, ruthless, and thoroughly enjoys the power she holds over others.

Role in the story: As a recurring antagonist, Karasugawa frequently crosses paths with the heroines, using her position as a teacher to monitor and attack them. She is not merely a brute; she also possesses practical skills that prove useful to Panther Claw. On one critical occasion, Honey brings Miki’s lifeless body to Karasugawa and requests an operation to revive her. Karasugawa accepts, performing the procedure, which demonstrates that she has medical or technical expertise. Ultimately, she meets her end—her status is listed as dead—but not before contributing to several pivotal plot points.

Key relationships: Karasugawa is directly subordinate to the higher leadership of Panther Claw. She has a particular fixation on Miki Saotome, an android girl who can transform into Sister Miki. She also shows immediate attraction to Honey Kisaragi. Her relationships with other students are purely exploitative; she views them as raw material to be molded into soldiers. There is a tense dynamic between her and Hiromi Tanaka, another Panther Claw operative, though the exact nature of their alliance is based on mutual utility rather than trust.

Development: Karasugawa does not undergo a redemption arc or significant change in her core nature. She remains a sadistic, power-hungry agent of Panther Claw throughout. However, her willingness to perform the operation on Miki suggests a certain pragmatism and possibly a twisted sense of professional pride; she will use her skills when it serves the organization’s interests, even if the beneficiary is an enemy.

Notable abilities: Apart from her cruelty and manipulation, Karasugawa is a master of kinbaku, a traditional Japanese form of bondage. Her preferred weapon is a tekagi shuko, a claw-like hand weapon. She also possesses a unique physical skill: she can swallow whole hen eggs and regurgitate them at will, using this as a grotesque intimidation tactic or projectile. In combat, she can transform into a battle-costumed armored form, enhancing her fighting capabilities. This transformation reflects her feline and harlequin-inspired aesthetic, consistent with Panther Claw’s animal-themed motifs.