Kekkaishi

According to the legend, five hundred years ago, there was an insignificant lord who possessed a mysterious power; this power draws ayakashi (supernatural creatures) to him. A demon exterminator, Tokimori Hazama, was called upon to protect the lord and the castle. The lord’s power stays on the land even when he had died. Thus, Tokimori founded the Hazama clan, who inherits his techniques, to protect the land for centuries to come. This land is Karasumori.
In the present day, Yoshimori Sumimura and Tokine Yukimura, heirs of the Hazama clan, are the kekkaishi that protect Karasumori. They are ability users (people who can use supernatural powers) who use a technique called Kekkai. Kekkai is a form of magical barrier to capture and destroy ayakashi that are drawn to this shinyuuchi (sacred land). Any ayakashi that stay on the land become stronger. Yoshimori and Tokine