10 Teams fight to uncover the secrets of the emeralds' origins and an old planet at war. AUTHOR'S NOTE: This is simply a work of fiction. As the Sonic universe is not known for perfect canon consistency, I will be taking liberties with some things, including my own take on some things which were either poorly done in canon or left unanswered.

During a fight, Katsuragi finds herself transported to a world where everyone she knows acts the exact opposite of how she knows them. Meanwhile, Japan is split into a more modern warring states era where technology is halted in the 80s and Ninja Arts are commonplace.