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.
Don't make me sound like 
the plague or something...
...لا تُصوّريني وكأنّني وباء أو ما شابه
Das klingt ja, als hätte er
’ne unheilbare Krankheit.
No lo digas como si fuera una plaga.
No lo digas como si fuera una plaga.
Cesse de parler de moi
comme d’un nuisible.
Parli come se fossi
uno spirito della pestilenza.
Não fala assim. Faz parecer até
que eu sou alguma praga...
Я тебе что, разносчица чумы?