From Uchu Kaizoku Sara.

Sara Scorpion

One of the empire’s knights. Leader of the Scorpion Legion, a group that’s part-mercenary, part-pirate. A feared pirate, known as pirate knight Sara.

After searching for the long-lost treasured sword for many years, she makes a deal with the Duke of Blankenheim, a member of a powerful family of the empire that holds information concerning the treasured sword. In exchange for such information, the Duke orders her to capture his antagonist, the hero of the Wales Tributory Alliance, Sylia of the Silver. A catastrophic dilemma falls upon Sara as a result of this.

Sylia Bernstein

Sylia of the Silver, a feared knight and hero of the Wales Tributory Alliance.

Thought to be the strongest knight in the galaxy, her skills as a knight surpass even Hans and Sara. The daughter of the powerful Bernstein noble family of Wales. She was forced to serve as general to protect the land of Wales. The lords of Wales don’t have territorial ambitions, and only wish for Wales’s safety. However, the Duke of Blankenheim believed that to be weak, and is the cause of him having his own territorial ambitions. Sylia realized this and began to plan to counter-attack the Duke of Blankenheim. During this time, though, the pirate Sara appeared before her.