The Earth is almost completely used up , after constant attacks against nature . All that remains of human civilization are a few ruined cities and some groups of people surviving in a devastated landscape. After years of exploitation and attacks against nature , the water on planet Earth has given out . In this arid environment , Sarah and Kim experience the saga and the adventure of surviving in Acuaria , a place full of danger and mystery. They experience challenges and conflicting emotions as they search for the rarest and most precious possesion on Earth : water.