Kekkaishi, Vol. 12 (Kekkaishi #12)

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.

With Yoshimori held hostage by the Kokuboro ayakashi in their impenetrable fortress, the stakes are higher than ever! Infighting within the Kokuboro cadre may provide the chink in the armor his friends need to rescue him. But can Tokine's and Yoshimori's families overcome their centuries-long feud to unite and overthrow their common enemy...?