In the late 1800s, Thomas Alva Edison is a famous inventor, but he is
also a master of fighting fallen angels who come into the human world.
This role is called an 'exorcist' in the church, but Edison, with his
new weapons, calls himself an 'artisan.' Levi is the son of a noble
house, but when he is orphaned by an angel, he decides to follow Edison.
Now he is Edison's apprentice, and does his best to make sure no one
again has to suffer as he did.
