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...
In other words, it was too 
stimulating for the little kid
Es war zu stimulierend
für das kleine Kind,
Fue demasiado estimulante para la pequeña
Fue demasiado estimulante para la pequeña
Donc c’était trop stimulant 
pour le bébé
Mi stai dicendo che la situazione
Em outras palavras, foi muito 
estimulante para a criancinha
Значит, для малышки, не знающей тонкостей 
отношений между мужчинами и женщинами,