Amu and her family are invited over to a friend's house for Christmas, but little did Amu know that it was going to be at Lulu's place. While inside, Amu noticed that Lulu was a good host. When seeing Lulu trying to assemble a Christmas Tree all by herself, Amu went outside to help. At first, Lulu refused help, but eventually, they both were in-sync. When they got back inside, Lulu saw her parents dressed in Christmas costumes. Being embarrassed, Lulu ran outside to get away. While wandering through the city, she saw a man dressed as Santa Claus being treated rudely by the crowd. Seeing the opportunity, she turned his Heart's Egg into a ? Egg. This backfired, however, as the man chased after her, eventually Character Transforming into Santa Dream. The Guardian Characters sensed this, and Amu transformed into Amulet Heart after catching up with the man. At first, Amu wasn't sure how to defeat him, but after filling his gift sack with pom-poms, his bag burst. Amu reasoned with him, changing his ? Egg into an X Egg.