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.
You're just a con artist who 
showed up with some shady offers.
أنتِ مُجرّد محتالة ظهرَتْ لتطرح
بعض العروض المُريبة
Du bist ’ne fragwürdige
Hochstaplerin, nichts weiter.
Sei solo un'avventuriera
che fa discorsi sospetti.
Você é só uma vigarista
que me fez uma oferta duvidosa.
Вы мошенница,
а идея ваша плохо пахнет.
เป็นพวกนักต้มตุ๋นที่รู้แต่ข้อมูลน่าสงสัยไม่ใช่หรือไง