Kekkaishi is ... A manga for boys by Yerou Tanabe. A hero in the third grade of junior high school who exterminates youkais at night school by using "Kekkai jutsu"(one kind of barrier). His childhood friend heroine (she is also a barrier master) is two years older. In 2003-11, serialized on weekly Shonen Sunday. 2006-08 TV animation onaired. (estrenada en 2003).