I must be dreaming (Sonic the hedgehog)

After battling Eggman and foiling yet another of his air-brained schemes Sonic discovers a young woman out in the snow.
The young woman awakes to find herself in a strange place, with a strange face staring back at her when she looks in the mirror.
Sonic and his friends decided to help her find out why she's there and how to get home.
A strange adventure rolls out ahead of the woman, bringing with it fear, bravery, excitment, friendship and even a hint of love. with all this, does she really want to go home?