Tokine and the Prince
A very popular boy comes to meet Tokine in school. When Yoshimori sees them leaving, he follows them together with Gen, who is suspicious of the boy.
Aired 18/06/2007EP 25 - Tokine and the Prince

2006
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)