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!
Showing up right at the good part yet again...
Ya está de nuevo. 
Justo en el último momento.
Ya está otra vez. 
Siempre aparece en el último momento.
Surgindo de novo
 para salvar o dia...