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.
and the demon lord is 
always born as a human.
.وهو يولد على هيئة بشريّ دائمًا
Und der Teufel wird immer
als Mensch geboren.
Un rey demonio siempre nace como humano.
Un rey demonio siempre nace como humano.
Tous les maîtres naissent humains,
e ognuno di loro nasce sempre umano.
e o lorde demônio sempre
nasce como humano.