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.
I've brought you a ticket to 
become filthy rich, after all.
فقد أحضرتُ لك شيئاً يجعلك تُصبح فاحش الثّراء
Mit mir hast du den Schlüssel
Traigo un boleto para hacernos ricos.
Traigo un billete para hacernos ricos.
Je t’ai apporté le composant.
Notre fortune est faite.
Ti ho portato qualcosa,
Afinal, eu trouxe um bilhete premiado
que vai te deixar muito rico.
Ведь я принесла тебе билет
в богатую жизнь!