Hyochuka

Hyochuka (氷柱花), also known as The Masked Woman, is Wabisuke Kofujiwara 's maid.

A ninja maid whose strength and cunning is equal to both Kogarashi and Fubuki. She somehow wears a mask similar to Kogarashi. She is the superior of Shizuku and Tsurara while the rest of her subordinates are just mechanical puppets she controls. A master kunoichi who can cloak herself to avoid detection and escape

She had threatened Naeka's grandfather and almost succeeds in killing Kogarashi using a fake whistle with the same effects. Her main objective is the assassination of Naeka, so Kofujiwara can get the inheritance.