Kekkaishi Blu-ray contains episodes 1-52 of the anime directed by Kenji Kodama.

By day, they're mere students, but at night, the students become the teachers!

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 Kekkai Techniques.

Protecting people from danger while growing stronger himself, Yoshimori will battle the forces of evil again tonight!