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.
Shut up! People have their reasons.
اصمت! لدى النّاس أسبابهم
Halt die Klappe!
Ich hab meine Gründe dafür, klar?!
¡Cállate!
¡Cállate!
La ferme ! J’ai mes raisons,
et ça te regarde pas !
Fa' silenzio! Ognuno ha le proprie ragioni
per fare ciò che fa!
Não enche! Eu tenho meus motivos.
Замолчи!