It started many thousands of years ago. When the universe was ruled by 2 groups of divine beings. The Highest and the Demons.

The Highests were the full-fledged creators of the universe.  And the Demons monitored the balance and the causes of conflicts among creatures.

But then among the descendants of angels one Highest is born. King of the Highests - All-Father, Takes the little Highest by force, as he is blessed by the "great Chaos", which made the little Highest stronger than all.

The Highest was raised by the All-Father himself and he gave him the name "Exetior". Exetior was not shown the love he wanted. The Highest was offended, And he decided to take revenge by gathering an army and starting a war with the Highests on the side of the demons. But Exetior lost the war and was locked in prison but he was able to escape becoming the Arch-Demon of Sharpness. While escaping from his former kin, he hid in Sonic's body and began a second attempt to overthrow the Highests.

He began to gather an army, starting with Tails, Knuckles and Eggman, so that the hedgehog himself would not interfere with him. He succeeded, but the army needs all of Mobius, the Arch-Demon began to demonize the inhabitants of Mobius. The final victims needed were three girls: Amy, Cream and Sally. However, it was more difficult with them, because they resisted. But some mistake happened because of which the girls appeared on the floor in the bloody temple in front of the Arch-Demon.