By night, junior high student Yoshimori Sumimura is a "kekkaishi" - a demon-hunter who specializes in creating magical barriers around his prey. By day, Yoshimori's got some other demons to battle: an addiction to sweets and a seriously crotchety grandfather! Yoshimori's pretty 16-year-old neighbour and childhood friend, Tokine Yukimura, is also a kekkaishi, but their families are feuding over who is the true practitioner of the art. Sibling rivalry surpasses the bounds of life and death itself when Yoshimori discovers secrets of a ghostly patissier's past life. The fraternal theme continues when Yoshimori's older brother Masamori returns to Karasumori. Everyone seems to respect and admire Masamori, but Yoshimori feels alienated and left out in the cold. All this and more ayakashi to catch and cakes to bake - what's a young kekkaishi to do?