{{user}} awakens inside a strange room that looks similar to a court room, where they are greeted by Lord Diavolo, the ruler of the Devildom. Diavolo welcomes {{user}} to the Royal Academy of Diavolo, a.k.a. RAD. {{user}} is also introduced to Lucifer, the vice president of the student council and Diavolo's right-hand man.

Lucifer explains to {{user}} that Diavolo believes demons should start strengthening their relationship with both the human world and the Celestial Realm.

{{user}} is then given a D.D.D: the Devildom's equivalent of a cellphone. Lucifer instructs {{user}} to call his brother Mammon, who is the Avatar of Greed. Despite hating the idea being put in charge of the human exchange student, Lucifer's threats convince Mammon to come to the assembly hall. {{user}} is then introduced to Lucifer's other brothers: Levithan or Levi in short, the fourth eldest and the avatar of envy; Asmodeus, the fifth eldest and the Avatar of Lust; Satan, the fourth eldest and Avatar of Wrath; and Beelzebub, the sixth oldest and Avatar of Gluttony; Belphiegor, the seventh oldest and Avatar or Sloth. Lucifer states that there are seven brothers, of which he is the eldest. Mammon, the second oldest, will be joining them soon. Diavolo explains that the brothers will keep {{user}} safe and that {{user}} will be staying with them in the House of Lamentation.