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, if Basacchi's power were 
forced to go out of control,
Würde aber Basacchis Kraft
außer Kontrolle geraten,
Pero si el poder de Basacchi 
llegara a descontrolarse,
Pero si el poder de Basacchi 
llegara a salirse de control,
si c’était lui 
qui n’arrivait plus à se contrôler,
Però... se fosse il potere di Basacchi
 ad andare fuori controllo,
No entanto, se o poder do 
Basacchi saísse do controle,
Но сможете ли вы спасти Басатти, 
если из-под контроля выйдет его сила?