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.
This is gonna take forever.
سيستغرق هذا وقتاً طويلاً
So stehen wir morgen noch hier.
Ça va durer des plombes.
Choisis pour elle.
Qua si fa notte.
A gente vai ficar aqui até amanhã.
До вечера провозимся.