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!
Was I interrupting? 
Should I come back?
¿Estás ocupado ahora? ¿Vuelvo luego?
¿Estás muy atareado? ¿Vuelvo más tarde?
Não sabia que estava ocupado,
 devo voltar mais tarde?