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...
However, please let Yuki-san do it, as well.
Aber lass Yuki-san ebenfalls mitmischen.
Pero te pediré que permitas 
que Yuki-san participe.
Pero te pediré que permitas 
que Yuki-san participe.
Toutefois, Basara,
Ad ogni modo, lascia libertà d'azione
 anche a Yuki-san.
Só que deixe a Yuki-san participar também.
Но позволь Юки помочь.