People view Amu Hinamori as a "cool and spicy" girl; she is actually timid and easily scared. When she wishes to have the courage to show her "true" self, she discovers three colorful eggs -red, blue, and green- in her bed. At school, the eggs draw the attention of Tadase Hotori, the most popular boy in school, who Amu has a crush on.

Nadeshiko Fujisaki, queen of the school, invites Amu to tea at the Royal Garden, where she'd meet the Student Council Guardians. However, during P.E. class, the blue egg begins to hatch, and its' Guardian Character runs away!

Nadeshiko tells Amu that the two should become friends, but Amu sees it as a trick to get her to join the Guardians. Ikuto Tsukiyomi, the mysterious stranger from last time, interrupts the two and attempts to steal the last of Amu's eggs.

Amu joins the Guardians as "The Joker", much to her dismay, and they inform her about the mysterious X Eggs. Ikuto tries to make amends with Amu. A mysterious new teacher named Yuu Nikaidou joins Amu's class.

Amu and Nadeshiko attend Kukai's soccer team practice. One of Kukai's friends, Yamada, is deeply upset when the coach announces he didn't make it to the team. Nikaidou takes advantage of Yamada's feelings and extracts Yamada's Heart's Egg, turning it into an X Egg.

Amu accompanies Yaya to the guardian's ballet class. During practice, the class's prima Maika Himekawa sprains her ankle and Yaya is chosen to be Maika's stand-in for the upcoming performance. Meanwhile, Nikaidou meets with Ikuto on the street and informs him that that Maika's egg may be the Embryo, but if it is not, Ikuto will need to clean up.

Amu takes her little sister, Ami, with her to a guardian meeting. While the Guardians hold their meeting, the Guardian Characters play with Ami and find a treasure map to a magical egg protected by a dragon.

Amu encounters Misaki Watarai, an energetic girl who is also in love with Tadase. After Saaya Yamabuki, head of Tadase's fan club, chides Misaki for Misaki's energetic personality and misunderstanding Tadase's conversation with Nadeshiko, Misaki becomes heartbroken and Nikaidou extracts Misaki's egg, but it hatches into an X Character.

Nadeshiko invites Amu to a sleep over so that the two can get to know each other better. But in order to keep Ami home, Amu makes up a story about the Seven Mysteries of the Fujisaki house. As Amu arrives at Nadeshiko's home, she begins to believe her own story. Amu and Nadeshiko enjoy their time together, but after Amu takes her bath, she gets lost inside the house. Meanwhile, the Guardian Charac...

Ami wants to decorate a Christmas tree with Amu, so after school, Amu and the Guardians shop for decorations. As the group leaves the store, Yoru steals Su's decoration and Su is separated from the rest of the group. Amu, Ran, and Miki search for Su, but eventually call it a night. Meanwhile, Su befriends a white shaggy puppy who is also lost. The next day, Amu and the Guardians search for Su. Su ...

The Guardians go to a winter training camp and stay with Kukai's grandfather, who is the priest at a temple near a ski resort. The Guardians enter a snow-sculpting contest, each building a part of a castle. However, Amu becomes discouraged with her gate. When Amu asks Miki to do a Character Change, Miki refuses. On the way back to the temple, Amu asks Tadase about the person he said he already lik...

Amu goes shopping with Nadeshiko and Yaya for a Christmas party. When Amu sees a music video by Utau, Yaya informs Amu that Utau is a new idol singer. Elsewhere, Utau is practicing her performance, but when she becomes disheartened, her manager, Yukari Sanjo, brings up Ikuto. Utau is then determined to work harder. As Amu hurriedly runs home, she comes to a park where different groups are performi...

Amu and the Guardians go to a live New Year's concert where Utau will be performing. While waiting, the Guardians realize that the Easter Company is the sponsor of the concert. Amu also sees Ikuto and follows him into a back area where she inadvertently overhears a conversation between Nikaidou, Yukari, and another person discussing the events that took place on Christmas Eve. As the concert begin...

The fifth and sixth graders are being taught how to snowboard by a top snowboarder in Japan, 11-year-old Mifuyu Torii. Amu's Guardian Characters detect that Mifuyu is about to create a powerful Heart's Egg, which also doesn't go unnoticed by Nikaidou. That evening, Mifuyu is about to compete in the preliminaries for a snowboarding competition. However, she becomes scared. When Mifuyu wishes to bec...

The Guardians learn that Snoppe is missing and set out in search for her. However, there is not much time left before Mifuyu competes. Meanwhile, Nikaidou analyzes Mifuyu's X Egg in a remote cabin, but is interrupted by Suzuki, Amu's admirer. Later, Amu nearly runs into Suzuki and brings him back to the resort where he tells the Guardians about the egg he saw. The Guardians find the cabin, but Nik...

The Guardians meet with child magician Zero, who is also fourth-grade student at the school named Takuya Nakagura. Takuya tells the Guardians about how he loves performing magic. However, as he became more popular, his manager did not want Takuya to perform real magic on stage, instead relying on CG effects. To help, the Guardians organize a magic show where Takuya performs under an alias. After t...

Nikaidou plans to use the next X Egg to create the Embryo and selects Kukai as his next target. Meanwhile, Amu is selected as the speech contest representative. The other Guardians lend their aid, but Saaya grows jealous when she sees Kukai and Tadase help Amu. Nikaidou takes advantage of Saaya's jealously and manipulates Saaya into giving Kukai false information about how Tadase was gossiping abo...

Tadase invites the other Guardians to an aquarium, however, only Amu is able to go. Amu begins to panic as the trip turns into a date with Tadase but she eventually calms down. As Tadase is about to tell Amu something important, they are interrupted by a little girl who quickly become attached to Tadase. As Amu and Tadase wonder what to do with the little girl, they spot an X Egg floating above th...

On the way home from a park, Amu's parents get into an argument about when they first went on a date. Eventually, they make up, but when they search for the photo Amu's father took when he first met with Amu's mother, they discover that it was missing. Amu's parents get into another argument because Amu's father placed the photo in a bird magazine and Amu's mother donated the magazine to a bazaar....

Kukai introduces Amu, Nadeshiko, and Yaya to his childhood friend, Sion. Sion is an aspiring pianist and will be leaving town soon to challenge her skills. On the way home from School, Kukai runs into Sion as she searches for a four-leaf clover. The next day, Amu encounters Kukai at a mall as he looks for a farewell gift for Sion. While they look for a gift, the two Guardians run into Sion. Meanwh...

Amu is home alone while her parents go to Ami's school play. Her parents ask her to sign for a crab, that was sent by her grandmother. After a bad encounter with the crab where Miki is caught, Amu goes to meet her parents at a French restaurant. Because Miki is pouting, Amu decides to leave the three at the front of the restaurant. However, Nikaidou steals them. Thinking that they ran away, Amu se...

The Guardians offer to help Amu find her eggs. They run into Utau and Saeki Nobuko, the spiritualist, along the way. Saeki can see the Guardian Characters and is at first frightened by them. However, she agrees to help the Guardians in their search. Utau also comes along because she does not like Nikaidou methods. Saeki drives like a maniac and eventually finds Nikaidou. As the Guardians confront ...

While awaiting Amu to arrive, Su convinces Nikaidou to let her clean up the messy laboratory and make a fresh cup of coffee. While cleaning, Su discovers an old photo of Nikaidou when he was a boy and his mentor. Nikaidou recalls his dream of being a robotics professor and when his own Guardian Egg appeared. However, Nikaidou gave up his dream when his mentor retired due to his wife's illness and ...

Amu's class is assigned to draw a composition about their favorite place at school. Amu also learns that Nikaidou has returned to the school as an actual teacher. As she visits various locations around the school, Amu reflects back to the events since her Guardian Characters appeared. When Amu turns in her composition, it is of the other Guardians sitting around the table at the Royal Garden.

Nadeshiko tells the Guardians that she will be leaving for England soon. Meanwhile, Amu is having trouble deciding whether she is in love with Kukai, Tadase, or Ikuto. Amu goes to the Royal Garden to ask Nadeshiko for advice, but finds Nadeshiko is not there. Amu then goes to Nadeshiko's home where she encounters a boy named Nagihiko, who claims he is Nadeshiko's older twin brother. Nagihiko runs ...

The school year ends, but Amu is depressed because Nadeshiko has left and Kukai will be graduating. To help cheer her up, Kukai teaches Amu a new move for Amulet Heart. Later that night, Ikuto wanders the streets and gets into a fight with two guys who were harassing two girls. Amu is also out shopping to cheer herself up, but she overhears the two girls as they escaped, talking about a guy with c...

A new school year begins and Amu wakes up to find a yellow Guardian Egg with a diamond pattern in her bed. Meanwhile, Utau steals more Heart's Eggs during a concert. This results in an argument between Il and Utau's second Guardian Character, El, causing El to fly away. Amu is excited that she and Tadase will be in the same class, but being in a new class makes her nervous. The class gets excited ...

Amu tries to catch her X Egg, however she literally bumps into El and takes El home. The next day, the new Guardians are announced. Rima is the new Queen's Chair and Kairi Sanjo is the new Jack's Chair. The new Guardians introduce themselves, but things starts off roughly and Amu is unable to tell anyone about the diamond egg. To deal with the rise in X Eggs, Tadase decides that the other guardian...

Kukai comes back to visit the Guardians. He notices that Amu is feeling down, so he decides to ask her what is wrong. As they talk, they encounter Utau. Utau shows Amu that she has Amu's diamond egg. Utau tries to goad Amu into a fight, but Amu refuses. With the power of the Humpty Lock, El does a Character Transformation with Amu, becoming Amulet Angel, and Kukai does a Character Transformation w...

The Guardians attempt to capture an X Egg, but Rima destroys it instead. Amu scolds Rima for not following the plan, but Rima thinks that Amu's methods are foolish. The next day, the Star and Moon classes are competing against each other in an athletic festival. Rima sits out since she does not see the point in getting all sweaty. When a girl in the Star Class is injured, Amu convinces Rima to tak...

Yaya convinces the Guardians to hold a special meeting at her house. It turns out that Yaya just wanted the Guardians to help babysit her baby brother, Tsubasa, because she does not want to. Yaya is jealous of her brother because he is always the center of attention instead of her. When Utau becomes the suspect in the rise of X Eggs, El interrupts the meeting. Amu tries to explain about El and her...

When Rima gets stuck with organizing the class's book collection, Amu stays behind to help out. Rima asks Amu to call her by her first name, and vice versa. While cleaning, Amu finds a popular gag comic, which Rima grabs and speedily reads. As she reads, Rima does a Character Change and cracks a joke in front of Amu. Embarrassed, Rima tells Amu not to tell anyone that she loves gag comics. Amu run...

Tadase and Amu go shopping together as Kairi follows them in order to spy on Amu. Amu sees a bracelet that she likes, but Tadase buys Amu a black heart-shaped barrette. Tadase buys himself and Amu ice cream, but Amu's ice cream drips onto her skirt and he runs off to go find a fountain to wet his handkerchief. Ikuto drops by and teases Amu. Amu becomes angry and ends up tripping on one of the shop...

The Guardians decide to investigate a house that is alleged to be haunted. However, Amu is scared of ghosts and does not want to go. Rima bumps into a boy at school who drops a small photograph of his family. The next day, the Guardians arrive at the house and begin their investigation, but Amu is frightened out of her wits. Ran, Miki, and Su chase after what they think is a ghost, but turns out t...

Amu's family receives a wedding invitation from Amu's cousin, Shuu. They go to the hotel where Shuu works and Amu finds him in the kitchen. Shuu's dream is to be a patissier and he is excited about his wedding and making his first wedding cake. When Shuu's fiancée, Eriko, arrives, Shuu sticks his foot in his mouth and earns a slap from Eriko. It appears that the wedding may be called off. To repai...

Shuraiya, a prince from a faraway country, makes a grand entrance to Seiyo Elementary to search for his future queen. Shuraiya also has a Guardian Character, Ramira. After seeing Amu transform into Amulet Heart and purify an X Egg, Shuraiya proposes to Amu. However, Amu refuses. Shuraiya informs the Guardians that the real reason he came to Seiyo Elementary was to find the Embryo. Shuraiya is sear...

The pendant Shuraiya receives from Utau begins to change his personality. Pearl, Shuraiya's servant since childhood, finds Ramira suffering because of the pendant's dark energy. She brings him to the Guardians and tells them that she has been able to see Ramira. Ramira informs the guardians about what happened the night before. Meanwhile, Shuraiya extracts Saaya and her followers' eggs, which beco...

Yukari tells Kairi to obtain the Humpty Lock from Amu. During a meeting, Kairi stares at Amu and the other Guardians believe he is in love with her. The next day, the Guardian Characters hold a secret meeting and El brings the lock with her. When Il and Yoru show up, a fight erupts. Amu and Kairi find the Guardian Characters and Kairi obtains the lock. Tsukumo, who works under Yukari, steals the l...

Easter is implementing its new project, the Black Diamond CD. It is rumored that a person will have their wish granted if they listen to it. Kairi slips one of the CDs into Tadase's bag. Tadase and Kiseki get into an argument and Kiseki runs off. At home, Tadase finds the CD in his bag. When Kiseki returns, he finds Tadase listening blankly to the CD and Kiseki becomes an egg. Kiseki goes to Amu f...

As Kairi cooks for Yukari, she informs him that he has one last job to complete. Meanwhile, Rima's mother wants Rima to resign from the Guardians because of the shifting pickup times. At school, Amu informs the Guardians about the Black Diamond CDs and they agree to confiscate all of them. While collecting the CDs, Amu learns about Rima's resignation letter, but Rima never turns it in. That night,...

The secret behind the Black Diamond CD is revealed and Kairi is conflicted about his sister's plans. Il becomes frustrated because Utau has been ignoring her recently. Meanwhile, the Guardians come to the realization that Kairi was an Easter spy. When Nikaidou gives the Guardians tickets to a special concert, the Guardians go to confront Kairi. As they arrive, they find Utau extracting X Eggs from...

Yukari reviews her plan to find the Embryo to her supervisor. Afterwards, she remarks about how useless Il is. Il becomes furious, but Diamond reminds Il about how Il teased El for being useless. Tadase tells Amu about his past with Utau and Ikuto, and how Utau enjoyed singing. The next day, all five Guardians confront Utau for the last time. Amu unsuccessfully tries to remind Utau about how Utau ...

With the X finally removed, Amu and Diamond Character Transform into Amulet Diamond. Utau becomes depressed that she lost to Amu, but Ami appears and helps reminds Utau of her joy of singing. Yukari leaves in the helicopter, but the X Eggs stored on board hatch and escape. The Guardians battle the X Characters. Utau Character Transforms with El, becoming Seraphic Charm, and flies up with Amu to th...

It is summer vacation and Amu reflects on the time since the school year began. Meanwhile, Kairi is preparing to go back to his parents while reflecting on his time with the Guardians. Later, Amu, Yaya, Rima, and Tadase go to visit Kairi and help Utau and Yukari move into their new office. While celebrating the opening of the new business, Kairi reveals to the rest of the Guardians that he will be...

During attendance day, the Guardians announce that the school will be participating in a choir contest. Amu ends up with the lead part while Marimo is chosen as the pianist. Because Seiichiro is a bad singer, Marimo helps him practice by playing the piano with him, and tells him about her dream to keep playing the piano. During rehearsal, Marimo makes a simple mistake and Saaya and her group criti...

Rima wins two tickets to her favorite comedy show and asks Amu to come along. As Amu and Rima pass by a park, they see a girl, Miyako, practicing her comedy act. Rima, unsatisfied with Miyako's performance, offers to train Miyako. After a Character Change, Miyako believes Rima to be a "Goddess of Comedy" and accepts the training. The day of the auditions, Amu and Rima visit Miyako backstage when H...

While Amu is busy with her summer homework, she receives a call from Yukari. Yukari asks Amu to be Utau's manager for the day because Yukari is sick. Amu grudgingly accepts and accompanies Utau to the TV station. However, they find out that Utau's appearance was canceled. Utau explains that because she broke her contract by leaving Easter, her reputation and popularity has plummeted. Amu becomes d...

Summer vacation is over and the Guardians return to school. Tadase thinks Yaya needs special training and asks Kukai to help. When a group of third graders come to the Guardians for help finding a lost bird, Kukai suggests leaving the search to Yaya. After begging from both groups, Yaya gives in. Yaya searches all day, but is unable to find the bird. The next day, Yaya dresses dress up as a detect...

Amu runs home and encounters Ikuto playing his violin. While Ikuto plays, Amu sings until one of the violin's strings breaks. Having no spare string, Ikuto and Amu go to a violin shop for repairs. At the shop, Amu meets Kotone, who has a crush on Ikuto and aspires to be a violin artisan. Another customer stops in and drops off two violins for repair, one of which the customer asks Kotone to repair...

One night, Kiseki sees the Embryo fly past him, but thinks it was just the moon. When Ikuto sees the Embryo the next day, he realizes that it is attracted to other eggs. Later, Kiseki tells Miki about his encounter with the Embryo, but Ran who was lisening misunderstands and starts a series of telephone-like retellings. Kazuomi Hoshina, Ikuto's stepfather, has one of Easter's employees plant a tra...

In a dream, Diamond asks Amu if she knows what her true wish is. Thinking about this, Amu encounters Nikaidou and Yukari. Nikaidou informs Amu that the Embryo should appear tonight. While the Guardians celebrate the news, Easters sets plans in motion to trap Amu and capture the Embryo. Ikuto learns of the trap and frees Amu. Meanwhile, hundreds of search devices powered by X Eggs search the city f...