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...
Have you come to take me down yourself,
Bist du gekommen, um mich
 persönlich zu vernichten,
¿Viniste a derrotarme tú solo,
¿Has venido a derrotarme tú solo,
Tu viens en personne 
pour m’attaquer,
Quindi sei venuto fin qui
 solo per occuparti di me,
Você veio pessoalmente me enfrentar,
Пришёл убить меня лично,