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...
all three of us have grown stronger.
sind wir alle drei stärker geworden.
los tres nos hemos fortalecido.
los tres nos hemos fortalecido.
on est devenus 
encore plus forts.
siamo diventati tutti e tre più forti.
nós três ficamos mais fortes.
все трое стали сильнее.