The unnamed late sister of Gotsutotsukotsu, she is a Nanban barbarian who, alongside Gien, were the finalists of Gengan's martial arts tournament which is held every four years. During their duel she was slashed deeply by Gien. She later developed a fever and died when her wound became infected.
Gotsutotsukotsu, who holds her sister's fighting strength in high regard, believes that Gien must have cheated in the duel and repeatedly tries to kill her in episode 6 of Otome Tairan. Gotsutotsukotsu is ultimately convinced by Batai that Gien had won the duel fairly.
Gotsutotsukotsu's sister and Gien were evenly matched
The last exchange between Gotsutotsukotsu's sister and Gien
Rendered unable to keep fighting after receiving a deep slash
Dying from a fever after her wound became infected