Clara's (voiced by Kelly Sheridan) birthday is coming, and Aunt Elizabeth (voiced by Kathleen Barr) gave her a nutcracker, but unexpectedly, Clara was involved in a magical legend. At night, the evil Mouse King led his minions to invade Clara's living room. The brave Nutcracker stood up to resist, but the enemy was too cunning, and the Mouse King cast a spell to shrink Clara. In order to find a way to return to their original appearance, Clara and the Nutcracker embarked on a journey. They were looking for the mysterious Candy Princess, who was the only one who could restore everything to its original state. However, the whereabouts of the Candy Princess remained a mystery. At the same time, Clara learned that the Nutcracker was originally a handsome and suave prince, and he became what he is today because of the curse of the Mouse King. Along the way, the two kind hearts gradually approached each other.