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.
I can't leave her with you because 
you might just up and run.
لا أستطيع تركها معك لأنّك
قد تأخذها وتهرب فحسب
und ich hab keinen Bock,
dass du mit der Knete durchbrennst.
Si te la quedas tú y huye,
estamos en problemas.
Si te la quedas tú y huye, la liamos.
Si je te la confie,
tu pourrais filer avec.
Se la lascio a te, 
potresti approfittare della cosa!
Quem garante que você não vai
simplesmente fugir, hein?
Оставлю у тебя — кинешь меня
и скроешься с деньгами.