Season 1

Mermaid Princess Lucia leaves her undersea kingdom in search of her magic pearl, who she left in a nearly drowned boys custody 7 years ago. See recap for complete info.

Hanon discovers her identity as the Blue Pearl Voice. After an underwater battle with a dark follower, she joins Lucia on land to help protect the sea kingdoms.

A new mermaid princess, Rina Toin, arrives at school, causing a stir. Lucia and Hanon become friends while facing off against a sea demon and searching for their lost pearls.

In this episode, a lonely mermaid princess named Rina Toin transfers to Lucia's school. Rina is aloof and guarded due to her past trauma, but she eventually joins Lucia and Hanon to stop a sea demon.

Lucia and Hanon as they worry about a pink dolphin named Momo who has been separated from her mother and captured by an aquarium. Lucia is determined to reunite the two, leading to a confrontation with a sea demon at the aquarium.

A mysterious love-related attack plunges the city into chaos. Lucia, Hanon, and Rina join forces to restore balance. Their bond of friendship is strengthened through song.

Lucia becomes jealous of a girl close to Kaito, which the enemies exploit to weaken her heart. Supported by Hanon and Rina, she realizes that her love is stronger than her doubts.

A demon plunges the inhabitants into emotional coldness. People become distant, almost inhuman. Lucia must believe in the warmth of her feelings to break the magical ice.

A song essential to the power of the mermaids is stolen. By recovering it, Lucia, Hanon, and Rina discover the importance of harmony among themselves. Their music becomes more powerful and coordinated.

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.

Lucia receives a special ring that could help her get closer to Kaito, but the villains want it for themselves.

Lucia and Kaito argue over a misunderstanding while a new attack puts them both at risk.

Lucia must participate in a ritual that tests her power and her heart.

Lucia relives important moments with Kaito while the villains plan a new attack.

Lucia and Kaito make a promise on the seashore; at the same time, the tension between Lucia's duty and her love grows.

Lucia tries to hide her true feelings, but her emotions affect her singing and her strength as a mermaid princess.

An unexpected moment between Lucia and Kaito changes the dynamic of their relationship and leaves Lucia even more confused

A young visitor appears and disrupts the balance between the protagonists, while the villains try to take advantage of the situation

With the arrival of summer, new temptations and jealousies arise; the mermaids must remain calm to continue fighting.

Lucia finds or writes a love letter related to the sea, which puts into words what she does not dare to say.

The first love of one of Hanon's is explored, and how it affects the group of friends.

A girl appears who steals glances and attention, causing insecurities and misunderstandings among the protagonists.

A kind of love "fever" runs through the characters; feelings get out of control as the villains attack.

Lucia fantasizes about being Kaito's girlfriend, while at the same time being forced to face the risks of her double life.

Kaito shows a deeper, more vulnerable side under the moonlight, and Lucia feels even closer to him.

Karen enters the scene with her own song and story, further complicating the situation between mermaids and enemies.

Naivety in love puts someone in danger; the mermaids learn that blindly trusting can have consequences.

The emotional bonds between the girls and with their loved ones are strengthened as they face a more serious threat.

An important confession is given indirectly or "masked", without revealing the whole truth about identities and feelings.

A cold stare, literally or metaphorically, marks a distance between characters just as the battle intensifies

The mermaids fall, or almost fall, into a trap well planned by the enemies, putting their secret and their lives at risk.

The dreams and desires of the protagonists are tinged with the love they feel, as they prepare for greater challenges.

Lucia and her friends visit an amusement park, but the villains turn the fun into chaos.

A young mermaid appears disoriented on the shore, and the girls must protect her from a surprise attack.

Lucia faces a difficult emotional moment.

Lucia and Hanon take in a mysterious lost baby who prefers Lucia and gets jealous of Kaito! Can the girls protect their tiny new guest from the Dark Lovers?

The girls chase the tale of magical mermaid beads that grant everlasting love, but when enemy forces intervene, the princesses must fight back!

Lucia gets jealous when an older woman keeps a close eye on Kaito during the holidays, but the mermaid princesses must focus and protect Christmas from enemy forces!

Chaos erupts at Hotel Pearl Piari when the Dark Lovers launch a sneaky surprise attack! The mermaid princesses must work together to clear out the enemies.

Lucia tries to grant Kaito's New Year's wish through a magical dream, but the Dark Lovers crash the dream realm!

Nikora gets a surprising marriage proposal from Maki, driving the girls to meddle in their romance before secret mermaid rules get broken!

When Hippo and Yuri are caught meeting in secret, Hippo is forbidden from seeing her. Heartbroken, Lucia tries to arrange a reunion until dark forces follow!

A tragic melody draws the mermaid princesses into a trap when a girl befriended by an enemy uses her voice to lure them in. Can they break the spell?

Trapped in a sudden blizzard, Lucia and Kaito get stranded together, but a dark attack threatens to ruin their icy moment. Can the mermaids save the night?

Lucia struggles with green-eyed jealousy as Kaito spends time with another girl, but enemy forces force the mermaids to act fast!

Kaito prepares to leave for Hawaii, leaving Lucia torn over revealing her true identity before he goes.

The princesses receive a dark invitation from Gaito, drawing them into a dangerous trap as the final conflict nears.

Kaito is tormented by dark visions of his true origin, forcing him to face a shocking reality about his connection to Gaito!

As Gaito's castle rises, Kaito learns the full truth about his destiny while Lucia and the princesses prepare for the ultimate battle.

Sarah joins Gaito, leaving the mermaid princesses heartbroken, but Lucia refuses to give up hope on her friend.

All seven mermaid princesses unite at last! Combining their full power, they launch a final assault on Gaito's castle to save the world.

Peace returns to the ocean, and Lucia and Kaito share an unforgettable moment before new journeys begin!