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 three kekkaishi-in-arms--Tokine, Yoshimori, and Gen--are not getting along! So much so that Gen's sensei, Atora, challenges them to a task requiring real teamwork! Meanwhile, when the Kokuboro princess falls ill, the ayakashi pursue her cure in increasingly nefarious ways. Plus, Gen receives a strange gift from an enemy--one that may reveal something about himself that he would prefer not to know!