Shin Megami Tensei: Digital Devil Saga 2

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Background:
In the Junkyard, rival tribes fight an endless war - vying for supremacy and the right to ascend to Nirvana. Everything begins to change when a blinding light interrupts a skirmish between two tribes. Serph, leader of the Embryon, awakens after the flash to find that his opponents have been violently slain. In a crater left behind lies a young girl with black hair. The people of the Junkyard soon discover the effects of the mysterious light; tribe members transform into demons, and feed an insatiable hunger by devouring their enemies. Along with this new "Atma" comes another strange power: emotion. Soon after, the Karma Temple issues a new law: "Devour the other tribes and bring the black-haired girl to Nirvana." Hostility only grows, as the tribes renew their efforts with increased hatred and zeal.