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.
I do not. It appears as though all 
of my memories have been lost.
لا أعلم. يبدو وكأنّ كافّة ذكرياتي قد فُقِدت
Nein. Ich scheine meinen kompletten
Gedächtnisspeicher verloren zu haben.
No. Parece que he perdido
toda mi memoria.
No. Parece que he perdido
toda mi memoria.
Oui.
Ma mémoire est complètement vierge.
No... Sembra che abbia perso
tutto il contenuto della mia memoria.
Não sei. Parece que toda
a minha memória se perdeu.
ค่ะ