Koya and Madarao
It's another night of Kekkaishi duty. Yoshimori encounters three minor ayakashi, Honetarou, Uhosuke, and Nagao, and easily captures them. However, Madarao's old companion, Kouya, shows up and in anger attacks everyone, including his followers. After a brief flashback of Ginro (Madarao) and Kouya's happy past gone wrong at the hands of the humans, Kouya gains power from Karasumori and transforms. Yoshimori releases the seal on Madarao revealing his real form. Madarao and Kouya then battle.
Aired 22/01/2007EP 11 - Koya and Madarao
Kekkaishi
Yoshimori Sumimura is a 14-year-old student at Karasumori School. Following in the tradition that's come down through the generations, he is the twenty-second Kekkaishi of the Sumimura clan. But he’s constantly fighting with his rival, Tokine Yukimura—his childhood friend and also a Kekkaishi—about who is the rightful heir to the magical barrier arts. Protecting people from danger while growing stronger himself, Yoshimori will battle the forces of evil again tonight!
(Source: Crunchyroll)