Ryota Endo, a salaryman in a Working Office at Kyoto, is living a peaceful life, until one day an unfamiliar pair of people approached him with a strange proposition to make. They both introduce themselves as members of a secret organization of Sorcerers and Exorcists that their purpose is to fight against demons.
Demons wonder around Kyoto so they want Ryota to become a member to their secret organization with only goal to annihilate every last one of them.

Ryota's quiet lifestyle and lack of ulterior motives is what makes him a perfect candidate for this team. What he thought he knew would change by this rather unexpected encounter, and he will be dragged into the unknown quest without knowledge about his purpose.