Ryota Endo a salaryman in a Working Office at Kyoto, is living a peaceful normal life as an average office worker, until one day an unfamiliar couple approach him with a strange proposition to make. They both introduce themselves as members of a secret organization of Sorcerers and Exorcists which their purpose is to fight against demons.
There demons wondering around Kyoto and they want Ryota to become a member to their secret organization with the purpose annihilate every last one of them.

Ryota's quiet life and his beliefs will be faced by this rather unexpected encounter, and he will be dragged into the unknown without a precise knowledge about his purpose.