Apocalypse Zero

Kakugo and Harara are siblings trained to battle the demons and monsters that haunt the post-apocalyptic 21st century. Equipped with advanced combat skills and "Zero armor"-suits forged from the souls of fallen warriors-they stand as humanity's last line of defense. But when Harara falls to the darkness within the armor, Kakugo becomes the only one capable of stopping his own sibling, armed with the same lethal skills and cursed equipment.