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Mystical forces are powerful in the region called Karasumori. For over 400 years, it has been the duty of a clan of Kekkaishi--barrier masters--to guard the land, exterminating the supernatural beasts which appear there night after night.
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.