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Lucia bids Kaito farewell as he leaves for Hawaii, but peace is short-lived as a mysterious new villain emerges.

Shocking news hits as Kaito disappears in Hawaii. Lucia refuses to give up hope, embarking on a dangerous search while new enemies strike!

Hanon faces a heartbreaking farewell as Taro leaves for Germany to pursue his music, but a new enemy attack disrupts his departure.

Sparks fly when Rina meets Masahiro Hamasaki, but dark forces disrupt their meeting. Can the mermaid princesses stop the new threat?

The girls enjoy a beautiful concert led by Rihito, but when the Black Beauty Sisters attack, the mermaid princesses must protect the music!

Kaito returns from Hawaii, but joy turns to horror when she learns he has lost all his memories of her!

Tragedy strikes as Michel absorbs Sierra's newborn soul! Holding only her orange pearl, Lucia vows to recover Sierra's lost heart pieces.

Heartbroken over Kaito’s lost memories, Lucia tries to bury her lingering feelings and move on just as a new enemy strikes!

Nagisa keeps trying to get closer to Hanon, leading to a chaotic "love lesson" while Hanon still misses Tarou.

As Masahiro gets closer to Rina, she struggles with her past and fear of falling in love until enemy forces crash in!

Rihito worries about his fragile sister Michal as she grows closer to Kaito. Lucia struggles with her own feelings while watching them.

Coco leads Lucia and her friends to the Indian Ocean to search for Sarah's cursed object, hoping it holds the key to saving Sierra's spirit!

Rina uncovers a surprising secret about Masahiro's family background, bringing them closer together as danger draws near!

Kaito follows Rina in search of clues to his lost memories, uncovering painful truths while dark forces shadow their path!

When a sacred glacier in the South Pole melts, catastrophic waves threaten the oceans. The princesses gather their song of hope!

Lucia, Hanon, and Rina invite Karen, Coco, and Noel to the beach house to save Maki's store from closing down! Can the mermaids pull it off?

Coco, Noel, and Karen play matchmaker to help open Hanon's guarded heart to Nagisa, who is head over heels for her!

A magical world grants two wishes, giving Hippo a reunion with Yuri and Sierra a day of fun with Lucia!

The mermaids head into battle to free Somegoro's people from the Black Beauty Sisters' dark magic.

Determined to uncover why Masahiro loves Rina, Karen goes on a test date with him while Coco and Noel spy from the sidelines!

Lucia's cleaning errand turns into an embarrassing surprise when Kaito walks in! Meanwhile, Amaya makes her dark debut.

Chaos ensues at Pearl Piari when a mystery thief steals a precious box Rihito gave Lucia! Can she track it down?

Michel's minions launch a massive attack on Rihito's concert, revealing Rihito's power! Aqua Regina grants the mermaids a new song.

From karaoke chaos to a ride with Rihito, Lucia realizes her heart still belongs only to Kaito.

Tricked by a fake fortune teller, Lucia tosses her prized ring into the sea and falls into Lady Bat's trap!

New villain Amaya debuts as a pop star idol! Can the mermaid princesses defeat her at her own concert?

After a fight with Sora, Miya runs away and unexpectedly stays with Lucia! Reenergized, she fights the mermaids alone until Sora risks it all to save her.

During a class trip to a greenhouse, Kaito sits by Lucia and recalls her birthday! But as Michal grows jealous, Sierra's spirit warns of danger.

Michel's servants team up to kidnap Hippo and use him as bait to trap the mermaid princesses! Can Hippo be saved in time?

Struggling to reveal her secret mermaid identity, Rina hesitates to confess to Masahiro until he promises never to let her go, and they share a kiss!

Hanon struggles with her feelings after Tarou writes to her, but a dangerous night with Nagisa leads to a romantic turning point!

Kaito finally breaks through his amnesia and remembers his love for Lucia! Can he protect her from Michel’s dark magic?

While Lucia celebrates her emotional reunion with Kaito, Miya realizes her human friends are actually the mermaids!

As Kaito leaves her side, Michal gives in to despair and listens to an eerie call tempting her away.

Desperate to end her pain, Michal merges with Michel! Aqua Regina grants the mermaids a new song as dark truths surface.

Trapped in Michel's dimension, the mermaids are saved by Sierra's song as Michel turns on his own servants!

As the final battle looms, Sierra asks Lucia to destroy Michel's statue body, uncovering shocking Pantharassa secrets.

On Christmas Eve, Sierra is finally reborn! Uniting their voices with Aqua Regina, the mermaids save Michel and Michal.

Peace returns to the ocean! All seven Mermaid Princesses host a massive reunion concert, and Lucia and Kaito share forever.