Students by day, demon hunters by night!

By night, teenager Yoshimori Sumimura is a "kekkaishi"--a demon-hunter who specializes in creating magical barriers around his prey. By day, Yoshimori's got other demons to battle: an addiction to sweets and a seriously crotchety grandfather! Yoshimori's pretty neighbor and childhood friend, Tokine Yukimura, is also a kekkaishi, but their families are feuding over who is the true practitioner of the art.

When a number of holy sites are attacked, the shadow organization suspects Yoshimori's mother is responsible, and sends an investigator to visit Yoshimori's family. Yoshimori rushes to defend the other who virtually abandoned him. Meanwhile, Ichiro Ogi, Masamori's archrival, lures Masamori to one of the holy sites…