After ending the battle against Zolgia, Basara regains his peaceful life with his two little sisters, Mio, the daughter of the previous demon lord, and Maria, her little sister who's also a succubus. As Basara pursues the preparations for the sports festival at school, one day he's attacked by a person being manipulated by magic. Recalling the strange gaze he felt at school, a suspicion of his begins to grow...
relying on the magic of demons 
and doing things like—
sich auf Dämonenmagie
zu verlassen und …
depender de magia demoníaca y hacer cosas...
mais te fier 
à une magie démonia…
sfruttare la magia dei demoni
 per fare queste cose...
depender da magia dos demônios
 e fazer esse tipo de coisa—