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.
You actually forgot? 
Even though you're a robot?
نسيتِ؟ رغم أنّكِ روبوت؟
Du hast ihn vergessen?
Obwohl du ein Roboter bist?!
¿Eres un robot
y te olvidas de las cosas?
¿Eres un robot
y te olvidas de las cosas?
T’as mauvaise mémoire,
alors que t’es un robot ?
Puoi dimenticare le cose?
Você esqueceu?
Mesmo sendo um robô?
Что ж у тебя память такая дырявая?
Ты ведь робот.