View source for Mermaid Melody Pichi Pichi Pitch Event Timeline

A timeline of the events relevant to the Oceans' Seven Kingdoms that occurred before the present time.

== The 1700 ==

* The ruling Panthalassa start a war for dominion of the Oceans, and when the situation becomes unmanageable, Aqua Regina uses the majority of her power to seal away the warmongering faction in the Panthalassa palace, creating the Sealing Key and giving it to Hippo. The peaceful Panthalassa choose to build new lives among humanity.

== 2003 ==

* Gaito, heir to the Panthalassa, is born with the Panthalassa's power of Darkness, in the perennial gloom of the Panthalassa castle that serves as their prison.

== 2004 ==

* The reigning Princess of the Indian Ocean dies, and Sara is born from the Orange Pearl to succeed her, on the 21st of November (Sunday).

== 2007 ==

* The reigning Princess of the South Pacific Ocean dies, and Coco is born from the Yellow Pearl to succeed her, on the 7th of August (Tuesday).

== 2009 ==

* The reigning Princesses of the Artic and Antartic Ocean die, and twins Noel and Caren are born from the Indigo and Purple Pearls respectively to succeed them, the former on the 12th of February (Thursday) 1 minute before midnight, the latter on the 13th of February (Friday), 1 minute after midnight.

== 2013 ==

* The reigning Princesses of the South Atlantic, North Pacific and North Atlantic Oceans die at different times of this year, and Hanon, Lucia and Rina are born from the Blue, Pink and Green Pearls respectively to succeed them, the first one on the 22nd of May (Wednesday), the second one on the 2nd of July (Monday) and the third one on the 31st of August (Saturday).

* Princesses Coco and Sara first meet, starting their strong friendship.

* Kaito, second son to the Panthalassa royals, is born with the Panthalassa's power of Light on the 21st of November. Aqua Regina, knowing that the two children together would have the power to destroy land and sea, and no longer powerful enough to free them from their cursed destiny, sends Kaito to the surface, to the Domoto family.

* After Kaito gets delivered to the lands, the Panthalassa imprisoned in the castle also die of unspecified causes, sans Gaito, leaving him all alone, the isolation then drawing him to make his first use of the power of darkness to turn 4 fishes into water demons who love him, the Dark Lovers.

== 2015 ==

* Sara meets and falls in love with prodigy pianist Mitsuki Taro, her love reciprocated and becoming all the stronger when Mitsuki finds out Sara is a mermaid on his own, ending all secrets between them.

== 2019 ==

* Thinking Sara's relationship with Taro would be doing no good to her duties, an attendant to the Indian Ocean tells him that Sara's duties will force her to choose between him and her home, prompting him to want to spare her the hardship, and breaking up with Sara without a single word, an act that leaves her heartbroken and plants a seed of darkness.

* Sara's tumultuous heart causes a storm over the Indian Ocean, destroying its kingdom and sinking a cruise that was passing through its water. Everyone on it dies, including the Domoto family. Moments before, their adopted son, Kaito had spotted Lucia singing in the water, and feeling herself drawn to him, the pink mermaid stays until the storm happens.

* Saving the boy and bringing him to coast, placing her pearl on him so its powers could save his life. When the boy starts waking up, Lucia rushes back into the sea without recovering her pearl, but always remembering the boy she got a crush on.

* Sara, feeling she has lost her right to be a mermaid princess, gives in to the darkness and steals the Sealing Key from Hippo, taking advantage of the hippocampus being asleep, using it to free Gaito from his palace, with the two of them sharing their pain to each other and becoming lovers.

* Motivated by a desire for revenge against Aqua Regine, Gaito sets out to fulfill his ancestors' ambition and gift the Earth to Sara, waging war against the mermaid kingdoms with the intent of gathering all the pearls and obtain Aqua Regina's power.

* Sara asks Coco to meet her, and despite knowing it's a trap, the latter agrees to meet her, not having given up on trying to mend Sara's broken heart. This ends with Coco being unable to heal her Heart, the South Pacific Kingdom destroyed and Coco captured.

* At the same time, Gaito's forces destroy the North Atlantic, South Atlantic and Artic Kingdoms, and Yuri captures Noel, after the Indigo Princess sacrifices herself to avoid Rina being captured. Hanon escapes the destruction of the South Atlantic thanks to her citizens stepping in to buy her enough time.

== 2023, sometime before July ==

* Gaito recruits the Black Beauty Sisters.

* Mitsuki Taro starts teaching at Radiant Heart.

* Eril plays around with the Sealing Key and loses it due to her carelessness, leading to Hippo getting the Sealing Key back and being able to free Coco, but the Black Beauty Sisters get it back in the process.

* Coco, the mermaid princess of the South Pacific Ocean, joins Radiant Heart Academy in search of a way to reach out to Sara and stop Gaito's ambitions.