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.
Regarding the launching of the rocket which 
will be the first step to this plan,
بخصوص إطلاق الصّاروخ الّذي سيكون
،الخطوة الأولى من تنفيذ هذه الخطّة
Dessen erste Phase sieht einen
von langer Hand geplanten Raketenstart vor.
En la primera etapa tiene programado
En la primera etapa tiene programado
devait débuter sous peu
avec le lancement d’une fusée.
Il primo passo consiste nel lancio del razzo
già programmato da tempo,
O primeiro passo do plano
é o lançamento de um foguete,
планируется запуск ракеты,
которая станет первым шагом…