Two worlds are divided by a wall. One is covered entirely in water. The other is a barren desert landscape. Only a sea nymph can dissolve the wall and allow the two worlds to merge.
A war unfolds in silence as worlds compete for survival. In one world, the earth has become drained of its oceans and become a dry wasteland. In the other, it is entirely consumed by water after all the melting ice caused massive sea levels to sweep over entire cities. In one world, marauders search for fresh sources of water. In the other, aquatic beings work with humans to find any survivors. In the end, the two worlds will collide.