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...
then it's likely we all would've died 
during the fight against Zolgia.
wären wir im Kampf gegen Zolgia
höchstwahrscheinlich alle draufgegangen.
lo más probable es que todos hubiésemos 
muerto en la pelea contra Zolgia.
lo más probable es que todos hubiésemos 
muerto en la pelea con Zolgia.
nous aurions pu tous mourir 
lors de notre combat contre Zolgia.
probabilmente saremmo tutti morti
 nel combattimento contro Zolgia.
nós todos provavelmente teríamos
 morrido na luta contra o Zolgear-dono.