Katanagatari Season 1 Episode 11

Mekki, the Poison Sword

The episode begins with a flashback detailing how Shikizaki Kiki first met Kazune Yasuri, the man who would one day become the first head of the Kyotouryuu style. Jumping back to the future, Emonzaemon and Houou Maniwa face off in the duel that left Penguin Maniwa injured at the end of the previous episode. Emonzaemon gains an advantage over Houou but is sliced down when Panguin hands him Dokutou Mekki. However, Houou loses his mind in the process and wounds Penguin as well.