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 gonna die an awful death 
if you don't take life seriously.
ستموتين ميتة بشِعة إذا لم تتّخذي
الحياة بصورة جدّية
Wer so in den Tag hineinlebt,
kriegt später die Quittung.
Si vives sin tener cuidado,
morirás pronto.
Si vives a lo loco, morirás pronto.
On survit pas
en étant de bonne foi.
Se vivi all'avventura
non farai una bella morte.
Você vai ter uma morte feia
se não tomar jeito.
Вам бы за ум взяться,
а то плохо кончите.