Kage (OVA)

It is the peaceful Edo period in Japan, and ninjas are hardly needed anymore.

Karyu, a particularly skilled ninja, is forced to do work as a hired killer.

She is asked to kill a merchant, but when she gets there, she finds that his servant is actually a ninja, who is just as skilled as Karyu.

Her name is Uzume.

Karyu and Uzume then compete against eachother in a bloody battle for superiority.