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.
After I get in and close the hatch, 
I need you to release those hooks.
،بعد أن أدخل وأغلِق الكوّة
أريدكِ أن تحرّري هذه الخطّافات
Wenn ich eingestiegen bin und die Luke
geschlossen hab, löse bitte den Haken.
Cuando entre y cierre la escotilla,
suelta ese gancho.
Cuando entre y cierre la escotilla,
suelta ese gancho.
Quand j’aurai verrouillé l’écoutille,
décroche le submersible.
Una volta che sarò dentro
e avrò chiuso il boccaporto, tu stacca il gancio.
Depois que eu entrar e fechar a escotilha,
você solta os ganchos.
Когда войду внутрь
и закрою люк, отсоедини этот крюк.