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.
Yeah, they were all the rage 
when they first came out.
أجل، أمست رائجة عندما ظهرت أوّل مرّة
Ja. Das war damals
das Gesprächsthema Nr. 1.
Cuando salieron,
todos hablaban de ellas.
Cuando salieron,
fueron la comidilla del pueblo.
Oui. À sa sortie,
le modèle s’est bien vendu.
Sì.
É, e ficaram bem populares
com esse lançamento.
Да уж. Тогда это прям сенсация была.