Shingeki no Bahamut: Genesis

Mistarcia is a land where mankind, demonkind and angelkind once joined forces to halt an impossible foe that threatened the existence of all three races. This entity that is known as 'The Bahamut', a dragon-like creature of gargantuan size and incalculable strength was sealed away for centuries through the sacrifice of the leaders of the angel and the demon race. Now, two millennia since the event that secured the continued existence of the three races, plans that have been set in motion to once more release the almighty Bahamut slowly become manifest and the most unlikely of heroes will be summoned as champions who will either stay the hand of fate or become themselves unwillingly the key to Mistarcia's end...