Oboro Shintou

The chief retainer and the older sister of Genshirou Ryuuga, the Black Dragon God. She is a stoic woman who moves into the Yuuragi Inn after being impressed by Kogarashi's strong physical and spiritual prowess. Her motivation to moving in is to preserve her family's bloodline by attempting to seduce Kogarashi. As she continues on this plan and interacting with the fellow tenants, she begins to display emotion and genuine romantic feelings. She and her brother have the ability to manipulate their arms into blades.

(Source: Wikipedia)