Due to the isolation caused by his strength, the Demon Lord Varvatos longed for a normal life, and after several thousand years he reincarnated as the villager, Ard Meteor. His dream is to forge bonds of friendship with other humans. However, even after turning 10 he still had yet to achieve his goal. During that time he has a fateful encounter with a young girl fighting monsters in the forest.
I swear it on the name 
of the Demon Lord Varvatos.
أقسم باسم ملك الشياطين فارفاتوس
Beim Dunklen Lord Varvatos.
Lo juro por el Señor Oscuro Varvatos.
Lo juro por el Señor Oscuro Varvatos.
Je le jure
au nom du Roi démon Varvatos.
Lo giuro sul nome del Signore dei Demoni Varvatos.
Eu juro pelo nome do
Lorde Demônio Varvatos.
Клянусь Варватосом, владыкой демонов.