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.

The Ogi Family's own mystical site is under attack, and even their ruthless heir Shichiro seems powerless to defend it. What are the attackers really after...? Then, having gathered reinforcements, the villains shift their focus to an even more ambitious target!

Yoshimori and Tokine have dedicated their young lives to protecting the Karasumori Site. Now its profoundest secrets finally come to light...