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.
What? Did you find some gold down there?!
ماذا؟ هل وجدت بعض الذّهب
!في الأسفل هناك؟
Was denn? Ein riesiger Goldklumpen?
¿Qué pasa? ¿Hay oro?
¿Qué pasa? ¿Hay oro?
T’as trouvé des lingots d’or ?
Cosa c'è? Hai trovato dei lingotti d'oro?
O que foi?
Você encontrou ouro por aí?!
Удиви! Золотые слитки?
อะไร เจอทองคำแท่งงั้นเหรอ