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.
So, yeah. Your new master is her 
grandson, meaning this kid here.
،لذا أجل. سيّدكِ الجديد هو حفيدها
أي هذا الفتى هنا
Und aus diesem Grund
ist dein neuer Meister ihr Enkel!
Ahora tu amo es su nieto, este chico.
Ahora tu amo es su nieto, este chico.
Désormais, ton nouveau maître
sera ce garçon, son petit-fils.
Motivo per cui
Enfim, isso significa que seu novo mestre
é o neto dela, este meninão aqui.
Короче говоря, твой новый хозяин —
её внук, вот этот паренёк.