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.
I don't think I'll ever be able to 
marry anyone but you now...
...لا أعتقد أن في إمكاني الزواج بأيّ شخص عداك الآن
Ich habe das Gefühl, dass ich
niemanden mehr außer dir heiraten kann.
Creo que ya no podré casarme
con nadie que no seas tú…
Creo que ya no podré casarme
con nadie que no seas tú…
Je…
Non credo potrò mai sposare qualcuno 
che non sia tu, Arata-san...
Acho que não serei capaz de casar
com outra pessoa que não seja você...