Kurosaka serves a daimyo determined to solidify control over Japan. Her striking appearance features long black hair, blackened lips, smudged eye makeup, and dark red samurai armor topped by a horned helmet with twin black spikes. Ruthlessly pragmatic, she sacrifices troops without hesitation, favoring merciless strategies to secure victories yet retreating when outmatched, balancing cunning with self-preservation. Empowered by the daimyo’s magic, she hunts forces that could challenge her master’s rule. She burns a temple tied to Abraham, grills villagers on Yasuke and Saki’s locations, and raids settlements for intelligence. Confronting Yasuke, she vomits a spear through the daimyo’s magic and conjures blades from her injuries, disarming him before Saki intervenes, shattering her weapon with arcane prowess. Forced to retreat, Kurosaka later begs the daimyo for stronger magic but is stripped of her enhancements, which are transferred to Mitsuhide—a betrayal that seals her demise. A skilled swordsman, she wields the daimyo’s sorcery to summon weapons mid-combat. Her name, blending “black” (黒) and “slope” (坂), embodies her ties to shadow and strife.