Jinpachi loses a fight to Nenji and is forced to get his hair cut like Nenji's. When Nanaka's glasses get broken, she mistakes Jinpachi for Nenji and asks for his help. Jinpachi agrees to go with her to the stores and do other activities that resemble a date with a little kid. Jinpachi's sister, Satsuki Arashiyama is not pleased with the development and tries to attack Nanaka, but Nanaka inadvertently dodges her attacks. Later when Nanaka is with Nenji, Satsuki tries to attack them again, but Nanaka trips and accidentally saves her from a falling wooden sword shard. Satsuki then asks Nanaka to be her big sister.