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.
You can't even tell that she's not human.
لا يمكنك أن تميّز حتّى بأنّها غير بشريّة
Allmählich wirkt sie wie
ein ganz normaler Mensch.
Parece un ser humano común y corriente.
Parece un ser humano normal y corriente.
Tout le monde doit la prendre
pour une vraie fille.
A vederla non sembra diversa
da un comune essere umano.
Não dá nem pra dizer que
ela não é humana, né?