Dr. Eggman finds a mysterious hedgehog named Ashura on an abandoned island alongside his father, the 2 of them were left there by a genetic research organization that Ashura's father was a part of and that considered Ashura a danger to society after finding out about his powerful genetic mutation that causes him to be the most powerful being alive and to gain unstable power the angrier he gets, with Eggman planning to use this powerful hedgehog Ashura against Sonic & his friends, the game primarily focuses on Sonic, Shadow & Ashura
