She and Tochiro met when they and Harlock got involved in a bar fight. She tries to hire them, but they refuse, not wanting to bound by money. It turned out that she'd wanted their help to rescue Admiral Horror's prisoners in his slave mine. They end up helping, anyway, having been caught, themselves. The fact that he blew up Horror's battleship apparently impressed her.
After Tochiro dies, she leaves with his casket, leaving Mayu with Harlock.