~ Prologue ~

A wizard named Merlina, granddaughter of Merlin, was running away from some pursuer, summons Sonic and his sister Y/N to help free the mystical realm of King Arthur, who has been possessed by an unknown evil that comes from Excalibur's scabbard, and is now ruling the realm as the tyrannical Black Knight. Sonic's speed and Y/N's crystal power will not end the Black Knight's reign, so they must take up two talking swords, Caliburn and Wolflobe and master swordsmanship in order to break Arthur's curse and save the kingdom.