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.
The name's Catherine!
!اسمي كاثرين
Catherine!
¡Catherine! Vuelve a llamarme señora
y te hundo en el mar.
¡Catherine! Vuelve a llamarme señora
y te hundo en el mar.
Appelle-moi « Catherine », vaurien,
ou je te fais boire la tasse !
Mi chiamo Catherine!
Meu nome é Catherine!
Я Кэтрин!
แคทเธอรีนย่ะ