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.
In order to make sure that my 
thought patterns are human-like,
من أجل الحرص على جعل نمط
،تفكيري شبه بنمط البشر
Um das menschliche Denkmuster
imitieren zu können,
Para imitar el pensamiento humano
yo también olvido cosas.
Para imitar el pensamiento humano
yo también olvido cosas.
Cela peut m’arriver,
Per replicare i pattern mentali degli umani
Para garantir que meus
pensamentos pareçam humanos,
Меня научили забывать информацию,