Aileen overcame all the difficulties and got engaged with Claude. Just when she thought she found her happily ever after, she receives news that a demon named Ashtarte attacked a human village in the Mirchetta region. Sensing new dangers, Aileen infiltrates Mische Academy in the Grand Duchy of Mirchetta to investigate the situation. There, she meets James Charles, the last boss of Regalia of Saints, Demons, and Maidens 2 as well as the other quirky members of the student council.
"We will not accept a demon lord who 
has fallen for the Holy Sword Maiden."
".لن نقبل ملك شياطين أغرم بعذراء السيف المقدس"
„Wir beugen uns keinem, der zum
Schoßhund der Schwertjungfer wurde.
"No aceptaremos a un señor
que pierda ante la doncella sagrada".
"No aceptaremos a un señor
que pierda ante la doncella sagrada".
« Nous ne nous soumettrons pas à un roi
asservi par la femme de la légende.
"Non accetteremo un Re Demone che 
si è innamorato della Fanciulla della Spada Sacra".
"Não aceitaremos um lorde demônio que se
apaixonou pela Donzela da Espada Sagrada."
«Князь Тьмы, попавший под власть 
святой мечницы, нам не указ!