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...
Fine! I'll prove I'm not lying!
Schön! Ich beweise dir,
dass ich nicht lüge!
¡Muy bien! ¡Te probaré que no miento!
¡Muy bien! ¡Te probaré que no miento!
Très bien !
Bene! Ti dimostrerò che non sto mentendo!
Certo! Eu provo que não estou mentindo!
Ладно! Я докажу, что не вру!