After the events of Sonic the Hedgehog 3, Grace-an immortal alien hedgehog gifted with chaos powers and energy-sets off on a quest to find Shadow the Hedgehog. She discovers him lost, suffering from amnesia and haunted by deep and painful memories of his past. But a new darkness is rising. An evil sorcerer, desperate to steal Grace's powers, has allied with another alien who has his own plans for Shadow. Now, it's up to Grace to help Shadow recover his memories-and for Shadow to protect Grace in return. Together, they must face the growing threat and fight to save the world before it's too late.

Genre: Adventure/Romance Rating: Mature (For mildly suggestive themes, violence, and language.) When mysterious ring portals open up on earth, they unleash a horror unlike any other. Shadow the hedgehog, alive and now a guilty, aimless wanderer; meets a mysterious bird girl who may be the key to helping him not only unlock his heart, but to defeat the horror that threatens the planet. Will they soar to new heights, or will reality as Shadow and team Sonic know it be burned to ash?