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.
Do you remember, Master?
هل تتذكّر يا سيّدي؟
Erinnerst du dich vielleicht, Meister?
-¿Te acuerdas, amo?
-Cómo voy a acordarme.
-¿Te acuerdas, amo?
-Cómo voy a acordarme.
Ça ne te rappelle rien, maître ?
Lei lo sa, padrone?
Você não se lembra, mestre?
Хозяин, а вы не помните?
มาสเตอร์จำได้รึเปล่าคะ