After three years of peace, the Metarex return with a plan involving the manipulation of the fake Chaos Emeralds, a plot which Sonic and his friends must rise up to fight, especially when they learn it leads to a timeline in which Amy loses her life. But when the choice falls to Sonic whether Amy lives or dies, Amy questions if she can trust Sonic with her life after all.

After an attack on Eggman gone wrong, Sonic and (who he assumes are) his friends awake without memories. He used to be a hero? Who runs faster than the speed of sound? And who is this "Amy" haunting his dreams? It couldn't possibly be "Rose," but he's starting to fall for her too. SonAmy.