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.
Um... what was it again?
المعذرة... ماذا كان يا تُرى؟
Ähm …. Was war es noch mal?
A ver… ¿Qué era?
Esto… ¿Qué era?
Zut de zut…
Je l’ai sur le bout de la langue…
Ma che cos'era?
Hã... O que era, mesmo?
Хм-м… как же там было-то?
เอ่อ มันคืออะไรนะ