Heavens Library & Crimson Lord brings back Arata, Lilith and the rest of the Trinity Seven to face off against the greatest enemy in the history of the Trinity Seven; Lilith’s own father, who is revealed to be the strongest Demon Lord who challenges Arata who is now a Demon Lord candidate.
we can't beat that demon lord 
as we are now, can we?
فليس باستطاعتنا هزيمة ذلك الملك
الشيطانيّ بمستوانا هذا، صحيح؟
können wir den Teufel
momentan nicht besiegen, oder?
je doute qu’on ait
une chance de le vaincre.
nello stato attuale non possiamo battere 
quel Signore dei Demoni, vero?
não podemos derrotar o lorde
demônio como estamos agora, né?