In the near future, much of the world has been forgotten at the bottom of the ocean due to rising sea levels. Natsuki Ikaruga, who lives in a small town surrounded and stranded by the sea, is invited by a mysterious woman, Catherine, to search for a treasure in his grandmother's house who was a marine geologist. One day, he dives to the bottom of the ocean in a submarine and encounters a mysterious capsule with a girl sleeping inside. The girl was a humanoid so sophisticated that she could be mistaken for a human.
It's been years since this 
thing's gone into the ocean.
مضى سنوات منذ دخل هذا
الشّيء المُحيط
Ist jetzt ein paar Jährchen her,
dass ich zum letzten Mal abgetaucht bin.
Esta cosa hace años que no se sumerge.
Esta cosa hace años que no se sumerge.
Ça fait des années
qu’il a pas exploré les profondeurs.
Anche questo coso
Já tem muitos anos que essa
lata-velha não mergulha.
Да и он уже несколько лет
не погружался под воду.
เจ้านี่เอง