Kunoichi no Rui is a fallen out of a ninja village. I couldn't keep up with the training and became a chore clerk. Rui, who was frustrated, practiced by herself and acquired her ability. One day, Rui asked Joshinobi to practice swordsmanship. At first, Kamishinobi reluctantly confronts him, but he is surprised by Rui's ability. Although he admitted that he was skilled in swordsmanship,