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.
She sure is slow. Are you 
sure she won't run away.
إنّها بطيئة. هل أنت متأكّد من أنّها لن تهرب؟
Die nimmt sich ja ganz schön Zeit.
Nicht, dass sie noch wegläuft.
Va muy despacio.
Va muy despacio.
Elle se traîne.
T’as pas peur qu’elle décampe ?
È proprio lenta!
Ela é bem devagar.
Será que ela não vai fugir?
Что-то отстаёт.
Не сбежит?
ช้ามากเลยนะ