When Dr. Eggman's latest invention malfunctions, Sonic and his many friends end up stranded in the Puyo Puyo universe, unable to get back home. When they arrive, Sonic and Tails quickly meet Arle Nadja and her friend Carbuncle and the four of them decide to work together to assemble their scattered allies and take down Dr. Eggman to send Sonic's crew home, unaware that he's picked up some allies of his own from this universe. Someone Arle knows all too well.
