Thirteen

Meihua Shisan is the Thirteenth Daughter of the Plum Blossom Swordsman, a master of kung-fu who believed no woman could master the sword, though to his dismay he had thirteen daughters. After seeing her father duel for the first time, Thirteen practiced in secret to learn the sword to impress him and become his apprentice. Seven happens to develop a crush on her after their second encounter and tends to hit on her. Thirteen's assassin rank is 38th.

(Source: Wikipedia)