After witnessing her family's death at the hands of bandits, Unchou Kan'u has dedicated her life to protecting the innocent by exterminating any bandit groups she encounters. Over time, Kan'u's deeds become famous throughout the land—even if she herself remains unknown. During her travels, she comes across a young girl, Chouhi Yokutoku, whose parents suffered a similar fate as Kan'u's. Finding companionship through their similar pasts, the two girls take a vow of sisterhood and continue to wander the land, determined to bring peace to wherever their journey takes them. During Kan'u and Chouhi's journey, they meet and travel with several people who are sympathetic to their cause, such as the noble Chouun Shiryuu, the headstrong Bachou Mouki, and the calculating Shokatsuryou Koumei. From problems with local lords to groups of ravaging bandits, Kan'u and her friends do what they can to make life a little easier for those in need, wherever they may be.