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.
Looks like she's talking to you.
يبدو أنّها تتكلّم معك
Du hast Besuch!
Te llama.
Te llama.
On te cause.
Ti sta chiamando.
Ela tá te chamando.
Тебя зовут.