1. "The Pearl Tear"- Lucia sets out to land to find the boy to whom she entrusted her pearl seven years ago. She finds him, but does not know it is him until later.
Songs: Legend of Mermaid, Taiyou no Rakuen, Daiji na Takarabako
2. "Feelings I Can't Say"- Hanon airs her disapproval to Lucia's new relationship with Kaito. But later, during a festival, she, too, finds love. Hanon's mermaid form is also revealed.
Songs: Legend of Mermaid, Taiyou no Rakuen, Daiji na Takarabako
3. "Swaying Thoughts"- Hanon finds out that the handsome man she met at the festival is her music teacher, Taro Mitsuki. A new girl arrives in Lucia's class. Meanwhile, one of Lucia's idols checks in to the hotel under a secret identity.
Songs: Legend of Mermaid
4. "The Lonesome Princess"- A new sea monster, Yuri, appears during a concert given by Taro Mitsuki and uses her music to hypnotize the attendees and attack the mermaid princesses, who are also there. Rina reveals herself to be a mermaid princess.
Songs: Legend of Mermaid
5. "An Icy Kiss"- When a young pink dolphin named Momo is separated from his mother and placed in the local aquarium, Lucia and company journey there to offer their help.
Songs: Koi wa Nan Darou
6. "Light of Love"- Nikora tells Lucia and Hanon a legend about a cave that grants true love to anyone who lights a candle with the bearer and his/her true love on it. As Lucia plans to light a candle with Kaito's name on it, she also experiences conflicting emotions when she realizes Kaito still hasn't discovered she is his precious mermaid.
Songs: Legend of Mermaid
7. "A Mermaid's Jealousy"- When Lucia hears a rumor that Kaito is dating an older girl, she sets out to investigate. Elsewhere, a beautiful emerald found in the ruins of Rina's kingdom becomes the star attraction of a cruise liner gallery, and Eriru attempts to steal it to lure the mermaid princesses to her.
Songs: Legend of Mermaid
8. "Frozen Feelings"- Lucia sets out to make a bento for Kaito, in high hopes that it will encourage him enough to help him win his next surfing competition. However, complications arise as the West Japan's surfing champ shows up in town.
Songs: Legend of Mermaid
9. "Stolen Melody"- Encouraged by how well Lucia's bento went with Kaito, Hanon decides to prepare a bento for Taro as well. They also find out about a tune their teacher wrote for the mermaid he met during a trip in India.
Songs: Ever Blue, Legend of Mermaid
10. "Images of the Past"- Rina is chosen as a model by a modeling agent who sees her as the mermaid he saw a long time ago. They also get a chance to overcome their past.
Songs: Star Jewel
11. "The Wishing Ring"- While on a class trip to an island, Lucia hears a legend about a buried treasure said to grant anyone one single wish, and sets out to find it in hopes it will help her relationship with Kaito.
Songs: Legend of Mermaid, Koi wa Nan Darou
12. "Crossed Hearts"- It is almost Lucia's birthday. Kaito and his friends are throwing Lucia a birthday party at a beach house. But a letter arrives from the palace in the North Pacific Ocean—Lucia's home—announcing that her coming-of-age party will take place on her birthday, the same day as the birthday party!
Songs: Legend of Mermaid
13. "Mermaid's Ritual"- As the Mermaid Princess Lucia undergoes a rite of passage, Gaito and his minions crash in to steal her pearl. Aqua Regina appears and gives Lucia a new song and tells her that she must summon her quickly.
Songs: Super Love Songs
14. "Memories of the Starry Sky"- Tomorrow is the anniversary of the day that Lucia (in her mermaid form) and Kaito met. Lucia wants to have a date under the starry sky, just like the day they met, and follows him around to work up the courage and ask him, but Kaito is visiting his parent's grave that day. Later on, Kaito realizes that Lucia is the mermaid, the one that rescued him, but only for a brief moment.
Songs: Super Love Songs
15. "A Promise at the Water's Edge"- As Lucia is looking forward for summer vacation, she asks Kaito to help her study for the pre-vacation exams.
Songs: Super Love Songs
16. "Hidden Feelings"- As the girls help Kaito and his friends work at a seaside restaurant to help the business, Rina realizes that she has some conflicting emotions regarding Kaito.
Songs: Super Love Songs
17. "A Fleeting Kiss"- Lucia, Hanon, and Rina enter a so-called haunted house, but later finds out about its secret. Meanwhile, Kaito—with another girl—also enters the house on a dare.
Songs: Super Love Songs, Legend of Mermaid(Slow)
18. "A Young Visitor"- Meru, a South Atlantic mermaid, comes to land, asking Lucia, Hanon, and Rina to help her find her mother.
Songs: Super Love Songs
19. "The Summer Temptations"- Lucia strays away in a crowd after the end of a rock concert. Now penniless and without her cell phone, she is accompanied by a boy, taking her around while helping her find her companions.
Songs: Jennifer's Song, Ever Blue, Star Jewel
20. "A Love Letter From the Sea"- Lucia, Hanon, and Rina find a love letter encapsuled inside a bottle. They then search for the letter author's identity.
Songs: Splash Dream, Super Love Songs, Star Jewel
21. "A Small First Love"- A little boy (Kaito's cousin) becomes fascinated by Lucia's mermaid form and vows to search for her. Meanwhile, Lucia, Hanon, and Rina join a beauty contest wherein a plasma TV set is up for grabs.
Songs: Super Love Songs
22. "Glamorous Girl"- Taro Mitsuki has been reassigned as Lucia, Hanon, and Rina's homeroom teacher. Elated, Hanon organizes an outdoor welcome party for him. At the party Taro Mitsuki follows a girl who he believes is a mermaid that he once saw.
Songs: Super Love Songs
23. "Love Fever"- A recent battle between the Mermaid Princesses and a Dark Lover has caused Kaito to catch a fever. Worried, Lucia stays at Kaito's home to nurse him back to health.
Songs: Legend of Mermaid
24. "Dreams Are Like Brides"- Meru returns to land in a playful attempt to marry Kaito.
Songs: Super Love Songs, Yume no Sono Saki he
25. "Moonlit Boy"- Lucia, Hanon, and Rina accidentally discover Hippo's ability to turn into a human. Hippo falls in love with a Dark Lover.
Songs: Super Love Songs
26. "Caren's Song"- Lucia, Hanon, and Rina join Kaito in his trip to a surfing contest. Meanwhile, the Dark Lovers attack the trio, but a new purple mermaid saves the trio.
Songs: Legend of Mermaid
27. "The Heart That Believes"- The purple mermaid introduces herself as Caren, the mermaid princess of the Antarctic Ocean and younger twin sister to Noel, whom Rina was with when she was captured. Rina then experiences a guilt trip as she remembers how she was forced to abandon her friend when Gaito attacked.
Songs: Super Love Songs, Voice In The Dark
28. "Bonds"- Lucia, Hanon, and Rina, in a quest to save Caren, are lured into a trap set by the Black Beauty Sisters. Aqua Regina gives the trio a new song.
Songs: Kizuna
29. "A Masked Confession"- Lucia's class has organized a play in which Lucia will act as the lead. But a surfing accident involving Lucia's leading man causes Kaito to star beside her.
Songs: Super Love Songs, Yume no Sono Saki he
30. "Eyes of Ice"- Gaito disguises himself as Kaito to know Lucia's feelings.
Songs: Yume no Sono Saki he
31. "A Dangerous Trap"- Lucia, Hanon, and Rina decide to use Rina to lure out the Dark Lovers and let them lead the way to Gaito's castle.
Songs: Star Jewel, Legend of Mermaid
32. "Love is Colored with Dreams"- Lucia finds a stone which makes dreams come true in one way or another. However, she starts running away from Kaito after a recent dream sees him being mad at her.
Songs:
33. "Amusement Park Panic"- An amusement park is about to open and while Lucia and Hanon are excited to go there, Rina senses something suspicious.
Songs: Kizuna
34. "Auri's Day"- Auri, an abalone spirit who is notorious for her exploding experiments, trains under Taki to be a magician and fortune teller. Lucia, Hanon, and Rina keep an eye on her so she will not get into trouble.
Songs: Kizuna
35. "Melody of Sadness"- Hanon is worried about Taro and goes to ask him about the mermaid he saw. Mitsuki-sensei tells Hanon, Rina, Lucia and Kaito about his story. The Black Beauty Sisters turn up to ruin his concert.
Songs: Kizuna, Return To The Sea
36. "Beloved Baby"- Lucia and Hanon find a lost baby and decide to take it in. However, this baby seems to have a bias for Lucia.
Songs:
37. "Rumored Couple"- Lucia, Hanon, and Rina hear a rumor about a set of beads said to be given to a human lady by a mermaid, which eventually led to that human's marriage.
Songs:
38. "A Christmas Present"- A woman approaches Lucia and dares her to show her Kaito's baby pictures. Lucia becomes depressed after Kaito shouts at her, telling Lucia that he doesn't have any baby pictures.
Songs: Yume no Sono Saki he
39. "P in P(Panic in Pearl Piari)"- Hours before a scheduled concert, Lucia, Hanon, and Rina bicker over some melon pudding. The Dark Lovers check into the hotel and try to resolve the conflict.
Songs: Legend of Mermaid, Super Love Songs
40. "An Epic New Year's First Dream Battle"- Lucia, Hanon, and Rina share a dream, which sees them having a career in show business.
Songs: Super Love Songs, Yume no Sono Saki he
41. "Love Among Grownups"- Maki, the owner of the beach house, asks Nikora's hand for marriage. As Nikora's decides, Lucia, Hanon, and Rina try to stop her, knowing she is also a mermaid.
Songs: Super Love Songs
42. "A Tears Location"- Hippo and Yūri are caught by Lucia, Hanon, and Rina having a tryst. Because of this, he is forbidden to see Yūri. With both Hippo and Yūri sad, Lucia arranges a meeting between the two.
Songs:
43. "Song of Suspicion"- Rina, Lucia, and Hanon are approached by three not very bright, self-centered men, who have been hired by Black Beauty Sisters to find and capture the Mermaid Princesses.
Songs:
44. "A Miracle on a Snowy Night"- A huge snowstorm cancels a scheduled skiing trip and causes Lucia to become missing.
Songs: Legend of Mermaid, Sekai no Ichiban Hayaku Asa ga Kuro Basho
45. "A Couple's Feelings"- Lucia and Kaito go on a date together. Lucia senses that Kaito's mind is still with his mermaid. Meanwhile, Izūru and Yūri have their hands on a camera.
Songs: Yume no Sono Saki he
46. "Goodbye"- On Valentine's Day, Lucia finds out that Kaito is heading for Hawaii. As Lucia is saddened by the news, Kaito comes after her to talk to her.
Songs:
47. "A Dark Invitation"- Gaito appears to Kaito in a dream. Sara appears to Mitsuki and gives him a key to Gaito's castle.
Songs:
48. "Kaito's Nightmare"- Kaito has a strange dream and at the end appears to be in Gaito's castle.
Songs:
49. "The Beat"- Sheshe & Mimi steal the two captured mermaids' pearls. Once they are used to power their evil microphones, the sisters dare the four Mermaid Princess to fight them. Aqua Regina gives the Mermaid Princesses a new song.
Songs: Kodou~Perfect Harmony~
50. "Darkness of the Heart"- Lucia, Hanon, Rina, and Caren storm Gaito's castle to stop his plans of world domination and rescue four friends in the process.
Songs: Kodou~Perfect Harmony~
51. "Ressurected Truth"- The six Mermaid Princesses find a hypnotized Taro Mitsuki, only to fight against one of their own.
Songs: Kodou~Perfect Harmony~, Return to the Sea
52. "Last Kiss"- Kaito has finally figured out about Lucia's identity. The seven Mermaid Princesses band together to defeat Gaito. But in the end, Sara joins Gaito in his demise.
Songs: Legend of Mermaid, Kodou~Perfect Harmony~, Legend of Mermaid (slow)
