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...
You know, actually, I became 
a member of the committee
Weißt du, eigentlich bin ich nur
dem Komitee beigetreten,
A decir verdad, me uní al comité
A decir verdad, me uní al comité...
Pour tout te dire, 
je me suis mis dans l’organisation
Sai, in realtà, sono diventato
 un membro del comitato
Sabe, na verdade, eu entrei
 para o comitê organizador
На самом деле, я стал организатором 
фестиваля по рекомендации Хасегавы.