Sakura becomes a fifth grader. Yukito gives her a watch as a present. Despite it being April, it begins to snow outside, which quickly turns into a blizzard. Sensing a Clow Card, Sakura, Kero, and Syaoran brave the storm to catch it.

Tomoyo prepares to sing as the lead vocalist of the school choir. However, the Voice Card steals her voice, rendering Tomoyo mute, much to the horror of Sakura and Sonomi. Wishing to hear Tomoyo speak again, Sakura and Syaoran go to her house to think of a plan to lure the Voice.

Sakura'a class go to a strawberry farm, learning Toya and Yukito are working there voluntarily. Syaoran senses something within the study room, but Meiling drags him away before he can investigate. Later, Sakura learns no one can enter the building. She, Tomoyo, Syaoran, and Meiling become locked in the room and can't escape.

Sakura develops a fever, but goes to school anyway, concerning her friends. She nearly collapses, but is carried home by Toya. Later, Sakura senses the Cloud Card nearby, which she thought its name was Rain, using the Mirror Card to take her place while she goes to catch the card. Toya finds out, but allows the Mirror to stay. Sakura is berated by Syaoran and Meiling, but they help her to catch the Cloud Card.

Sakura, Tomoyo, Meilin and Syaoran head to Tokyo for a day of fun. The four are not alone in their venture as the Dream Card, in the form of a butterfly, tags along. When the group enters Tokyo Tower to see an exhibit there, Sakura falls under the Dream's spell.

Ms. Mizuki announces that the class will by doing a play of Sleeping Beauty for the school arts festival. Sakura realizes that the woman she sees in her reoccurring dream is Ms. Mizuki. Roles are assigned by amida drawing. Sakura has the role of the prince and Syaoran is the princess. They agree to practice their lines together in the morning at school. They practice outside and almost get to the kissing scene, when the Sand Card forms a vortex around them.

Sakura and Syaoran are working hard at memorizing the play. Finally the day of the play comes, and after a few denials about going out on stage from Syaoran, the play is on. The play goes well until right before Sakura and Syaoran kiss, when the Dark card appears. Sakura is almost lost in the Dark card until she realizes that she holds the Light card in her heart. The two card counteract each other and show themselves. Sakura seals both cards and before being sealed, they tell her that the final judgment is coming and that is will be up to Yue.

Meiling receives news that her mother wants her to return home to Hong Kong. Devastated, particularly by Syaoran's reaction, Sakura abruptly invites Meiling to a sleepover. Meiling reveals how she and Syaoran grew up together, and she forced him into their engagement, but on the condition that if he fell in love with someone else, she would end the agreement. The Twin Card appears in town, replicating things.

Sakura once again has the dream in which she is facing the Tokyo Tower. She clearly sees Ms. Mizuki, but this time, Mizuki is accompanied by another figure with long hair and wings. She wakes up early to see Yukito compete in an archery competition. She meets up with Syaoran and Tomoyo at the archery competition, and Kero tags along too. At the archery tournament, Sakura finds that Ms. Mizuki is one of the challengers and ends up in the finals alongside Yukito. During the fierce match, Kero pokes his head out of Sakura's bag upon sensing tremendous magical power, shooting a piercing glare at Ms. Mizuki.

Sakura and Kero combat the destructive Earthy Card, putting the Tokyo citizens to sleep, including Yukito. Using the Wood Card, Sakura is able to restrain Earthy, letting her catch it. With the final Clow Card complete, Kero transforms into his true form of Cerberus, a winged lion. However, the Final Judgement is at hand.

Sakura initially refuses to fight Yue, but she tries to find card that can confine him without hurting him. She uses the Wood Card, but as its power falls under Yue's sign of the moon, and he turns it against her, and Yue declares she has failed. Sakura learns that if she fails the Final Judgment, everyone who has ever had anything to do with the cards will forget their feelings for the person they love the most.