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.
Suave newcomer Soji, sent by the Shadow Organization, proves quite useful in battle against two powerful ayakashi. Nevertheless, our friends suspect he might have something to do with the recent devastating assaults on mystical sites and their guardians. So telepathic Sen gets spy duty and learns some intriguing but ambiguous information... Meanwhile, Yoshimori tries to break a spell cast on Karasumori--with unexpected results!