Iruma and Lead end up being trained by Robin's relative, Barbatos Bachiko. Bachiko is very skilled and was personally asked by Sullivan to assist Robin with tutoring the kids. They were supposed to have a rather hard training schedule... but all Bachiko asks them to do is random errands. Lead has had enough of that and goes back to Robin. Iruma is left frustrated and alone. He learns that Asmodeus and Clara have been training and decides to take matters into his own hands!
It is the duty of all the students 
of the demon school Babyls
ومن واجب كل طلاب مدرسة شياطين بابيليس
El deber de todos los alumnos de Babyls
El deber de todos los alumnos de Babyls
Il est du devoir
de chacun d’entre eux
Salire di rango tramite gli esami 
è dovere di tutti gli studenti
O único dever dos estudantes da escola de demônios
Babyls é subir de ranque através da prova.
Тем более что главная задача школьников —
взбираться по лестнице иерархии наверх.