Dantalion, one of the many candidates for Lucifer's throne, decides to live in the human world an attend William's school and lobby the young noble to choose him as Hell's ruler, but he gets more than he bargained for when William's friend Isaac accidentally summons one of his competitors!
A demon paying tuition is just preposterous.
¡no puedo creer que los demonios 
vayan pagando matrículas!
¡no puedo comenzar a creer en demonios
que pagan matrículas ajenas!
Sabe bem que um demônio pagando
 os seus estudos é irracional.