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.
Not to mention this prosthetic 
leg is an older model.
ناهيكِ عن أنّ هذه السّاق الاصطناعيّة
هي نموذج أقدم
Meine Prothese ist ein
ziemlich altes Modell, weißt du?
Es lo que hay. Es una prótesis antigua.
Es lo que hay. Es una prótesis antigua.
Déjà que cette prothèse
est un vieux modèle…
Dopotutto questa protesi è un vecchio modello.
E porque é uma prótese de
um modelo antigo, também.
Хотя он и без того
слишком старый.