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As Christmas approaches, Ichigo grows depressed as she thinks about how she is regularly lying to Masaya to hide her being a Mew Mew. Zakuro invites her to go shopping with her and tells Ichigo that since she cannot open her heart, she should give Masaya something that reflects her feelings. Ichigo chooses a necklace called "Tears for Christmas." She is still initially reluctant to face him, but finally arranges to meet him at the big Christmas tree in Odaiba. While she is waiting, the aliens attack. When Ichigo transforms, her emotions cause mew aqua to materialize at the top of the tree. Joined by the others, the Mew Mews prepare to fight the aliens to acquire it.
Ryou and Keiichiro learn that mew aqua may have been made by the aliens when they inhabited Earth. A strange type of energy begins emerging in Tokyo and trees grow out of control, turning the city into a forest. The Mew Mews find something that appears to be a large mew aqua in a tree but before they collect it, Tart arrives and turns the tree into a chimera anima. During the fight, Mew Ichigo realizes that Ryou cannot be the Blue Knight as they both appear at the battle to aid her. The Mew Mews defeat the monster, but they are unable to figure out what caused the forest to appear in the first place.
For Valentine's Day Ichigo decides to make chocolate for Masaya, with help from Keiichiro. On her way to meet him, she is attacked by Kish who knocks away her transformation pendant. Masaya senses that Ichigo is danger and comes to her rescue. After Kish injures him, Masaya begins glowing and transforms into the Blue Knight, however with the injury he is unable to fight at his full strength. Just as Kish is about to kill him, Ichigo grabs her pendant and runs in front Masaya to block the attack using a shield from the pendant. Ichigo rejects Kish and he leaves. Later, as Masaya enjoys the chocolates from Ichigo, Kish wonders who or what Masaya and the Blue Knight really are.