The Mysterious Shadow - S2.E8

Yukimura and Matabei are assaulted while returning from research into the Samurai Bible by an unknown assailant who is driven off by Inshun. The next day Hanzo and Matabei are regretful that they can't protect their masters during conflicts in the past. Everyone in the dojo have a meeting about the unknown assailant while Satchin and Jubei continue their Ki training in which Satchin runs across Inshun. Jubei takes Inshun along to spend time with her for the day during which she gives her the nickname Inko-chan. They both agree to be friends after the upcoming battle. That night Muneakira, Jubei, Yukimura, Sen, Matabei, and Hanzo go searching for the mysterious assailant. Sen is attacked during the search but Hanzo is unable to protect her. Only through Inzo's intervention is the assailant driven off but the group mistakes Inzo as the actual assailant.