Lady Asano was the widow of Lord Asano Nobu who was assassinated by a scheming vassal named Oda. Lady Asano swore vengeance on Oda and pursued him, forsaking the lifestyle her title offered her. Meeting with Usagi and Gennosuke, she mistook Gen for General Murakami, who Gen later revealed was his father and a retainer of Lord Asano. Gen, however, wanted nothing to do with the woman and stormed away.

Lady Asano was recognised by Oda, who was the magistrate of the town and was taken into custody. She was rescued by Usagi and Gennosuke only to pursue Oda once again. Catching him, she was mortally wounded by Oda, but managed to slay him before her own death.