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...
We wanted to deepen our bond of trust.
Wir wollten unser Vertrauen stärken.
para fomentar la confianza entre nosotros.
para fomentar la confianza entre nosotros.
et ainsi renforcer les liens 
qui nous unissent.
Volevamo intensificare
 il nostro legame di fiducia.
Nós queríamos aumentar os
 nossos laços de confiança.