This is a mysterious world where humans, gods, and demons live together. In the past, Bahamut, the black-silver winged man, almost destroyed the world. But after humans, gods, and demons fought together and made great sacrifices, they finally sealed its power. Then, gods and demons each kept half of the key. Two thousand years later, the world has always been peaceful. I don't know when, humans regarded Bahamut as a unique and noble existence, fearing and worshiping it. One day, a girl took away the key of the gods who were well protected. The balance of the world was gradually broken. When Bahamut roared again, the world fell into the abyss of despair again. Oh, world, destroy it! A certain voice begged so willingly.