The story tells the story of Death Weapons Craftsman College, referred to as "Death Martial Arts College". The students in the college are divided into "artisans" and "weapons", and their purpose is to collect 99 souls that break away from human orbit and form "the egg of ghosts and gods" and "the soul of witches". When the "weapon" devours these 65,438+000 souls, it can be upgraded to death scythe, a special weapon for death.