In this era, demons and monsters roam the streets at night. Humans and familiars work as partners who kill those monsters. Civil servant Fan Xiaotie and the strongest demon girl Linyu of the secret departmen...

Ryuuko Matoi is a girl who travels with a single red scissor blade, searching for the wielder of the other blade who killed her father. She arrives at Honouji Academy, a high school that lives in fear. It is...