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...
A while back I made Naruse's power 
go out of control during battle,
Vor einer Weile habe ich Naruses Kraft
im Kampf außer Kontrolle geraten lassen …
Basacchi te salvó cuando hice que tu poder 
se descontrolara durante nuestro encuentro.
Basacchi te salvó cuando hice que tu poder 
se descontrolara durante nuestro encuentro.
Lors de notre combat, 
tu n’arrivais plus à te contrôler
Ricordate quando ho fatto perdere il controllo
 a Naruse durante il combattimento,
Um tempo atrás, eu fiz o poder da 
Naruse sair do controle durante uma luta
В бою со мной ранее сила Мио вышла из-под 
контроля, и Басатти спас её.