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...
If that's the case, then 
why don't you prove it?
Wenn das so ist, wieso beweist du es nicht?
En ese caso, ¿por qué no lo demuestras?
En ese caso, ¿por qué no lo demuestras?
Se davvero è così, perché non ce lo dimostri?
Se é esse o caso, então por
 que não nos prova isso?
Раз на то пошло, покажешь?