The council's rampage sends quakes through the demon realm, and the demon Chaos is called forth through a giant magic circle. That commander of all heroic spirits flails madly, seeking to claim Basara, Mio, and Leohart's lives. Do they even stand a chance of victory with this supreme being before them?!
Meanwhile, Maria, Yuki, and the others put a final end to their own personal battle.
"Believe in me... once more."
The ultimate sibling combo risks their lives to face the disaster striking all of the demon realm!
If the demon realm's wars dwindle,
Wenn die Kriege des
Dämonenreichs schwinden,
Al apaciguar los conflictos del mundo
 demoníaco, menos gente querrá ir tras Mio.
Al apaciguar los conflictos del mundo 
demoníaco, menos gente querrá ir tras Mio-chan.
Et une fois la guerre terminée,
Se le guerre nel mondo dei demoni diminuissero,
Se as guerras no mundo 
dos demônios diminuírem,
И если это успокоит распри в мире демонов, 
нацелившихся на Мио станет меньше.