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!
They're acting like they know each other.
Así que se conocen, ¿no? 
¿Qué son? ¿Amigos, enemigos?
¿Entonces os conocéis? 
¿Qué sois? ¿Amigos? ¿Enemigos?
Falam como se fossem íntimos!