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 even sent you to the Academy and you 
had the nerve to come running back?
وحتّى أنّني أرسلتُك إلى الأكاديميّة
فتجرؤ على العودة مُسرِعاً؟
Da schickt man dich extra auf die Akademie
und du kommst nach Hause zurück.
Te dejé ir a la academia
Te dejé ir a la academia
Je ne t’ai pas envoyé à l’Académie
pour que tu files et reviennes chez moi.
Ti ho anche mandato all'accademia!
Até lhe mandei para a Academia, e você
teve a audácia de fugir e voltar para cá?
В Академию тебя устроила!
อุตส่าห์ส่งเสียไปจนถึงอคาเดมี