It's the day before Christmas, You (as either Aster and Asteria) are an orphan living with your relatives. You were onto your usual bad mischief,  when Elvis, Santa's right-hand Elf had jumped down to his/her room.

Elvis tells you that most kids like you are onto no good. These kids are giving Mr. Nightmare  more power, and he is on his way to shut down Christmas, forever. Christmas is on the brink of collapsing, and Elvis has been asking all the "Naughty Kids" to start doing good deeds to repent for their mischievousness if they want to save Christmas.

None of the kids bothered to listen to Elvis the Elf. But your parents loved Christmas, and you wanted to save Christmas in to keep the family traditions. So, along with Elvis the Elf, You are set to save Christmas and overcome the evil of Mr. Nightmare.