Kousetsu

Kousetsu is a kunoichi of the Iga school who has known the protagonist Kazutoki Sakuba since their earliest years, silently serving as his guardian from the shadows before enrolling alongside him at the ninja academy. She is rarely seen without her black mask, and she speaks little, carrying herself with an unshakable composure. Though the truth of her origins eventually comes to light—revealing her to be the illegitimate daughter of Kodo Minobe, the Koga clan's leader—she remains unwavering in her allegiance to Iga, demonstrating profound loyalty and a deep bond toward Kazutoki.