The epic tale of humankind's struggle in the Genesis war WOULD MAKE A FUCKING EPIC ANIME BY ITSELF.
Think about it, 26 D-Knights makes for a potential brickshatting 26 GAR DEATHS. IN A SINGLE ANIME. FUCK YES.
Seria Mauser's BAWWW scene where she forsakes everything she loves in order to save her brother and sister, only to find out they died anyway, trying to defend humanity in the last battle that wouldnt have been possible if not for her betrayal. She just completely rages upon finding out upon that she was the one who caused their deaths.
Finally, Lord Browning's epic GAR death scene where he enacts the Providence Breaker plan.
Anime ends with the beginning scene where Pacifica is tossed off the cliff and then rescued.