The Black Cat is an artificial intelligence-controlled robotic feline used to communicate between the user and the Akudama. Its objective is to gather them together for Cutthroat's execution, which will force them to complete a mission. Despite being ruthless in achieving its goal, the Black Cat possesses exceptional strategic thinking abilities. It devises an intricate plan to bypass security measures at Kansai Station and Shinkansen. The cat is indifferent towards minor losses or changes in plans as long as the mission succeeds.
Black Cat has a sleek black fur with white whiskers, eyebrows, yellow eyes, a red collar adorned with a golden coin and silver buckle, symbolizing its status as an elite member of the Akudama.