The school is run by Shinigami-sama, the God of Death himself, as a training facility for Weapons and the human wielders of those weapons, the Meisters. Each Meister has at least one Demon Weapon companion which has both a Weapon and Human form. Shinigami created the school as an organization that protects peace in order to prevent the reign of the Daughter of the Kishin, an evil demon god that in the past, nearly destroyed everything by plunging the world into chaos.

Welcome, students. And good luck.