The premise of Kekkaishi is simple: Yoshimori Sumimura, a seemingly unremarkable fourteen-year-old boy, is a kekkaishi, or barrier-master. When he isn’t consuming unhealthy amounts of coffee-flavored milk, dozing off in class, or baking architecturally magnificent cakes (one of his pet obsessions), he’s patrolling the grounds of his school, which sits atop the Karasumori, a locus of magical energy that proves irresistible to ayakashi (demons) looking to augment their power. Yoshimori traps unwanted visitors within cube-shaped barriers, then vaporizes them, barrier and all.