Setting:CATastrophe

In a world covered in endless water...

Animal eared people reign supreme.

After the polar icecaps melted, the world was flooded, and everyone died in the resulting blunder

Save for rock monsters, animal eared people, and some tenacious sea sponges, insects, and birds.

This is the world of CATastrophe.

Premise

The world of CATastrophe is a post-humanity world where pristine waters have flooded human cities, and where carefree kemonomimi spend most of their time swimming and sunbathing, and explore the ruins of human society for loot and adventure.

Background

At some point in the future, global warming, Williams, creepy scientists or something causes the icecaps to melt, and the ocean's ecosystem is devastated. Humanity turns to exactly the wrong group of scientists (essentially a personification of /tg/) to fix the problem. The solution they come up with is essentially to create some nanites that prevent oxidation and spend the rest of the money creating a wide variety of kemonomimi. When he was kicked out of a meeting for suggesting the creation of giant futas with expanding breasts featuring fuckable nipples, a Dr. Williams swore revenge against the scientists, and reprogrammed some of the nanites to kill. The nanites wiped out humanity, but the kemonomimi were immune. Left living in the ruins of a flooded human society with nothing better to do than live every day like a beach party.

Chloronated Ocean Alternate

Chlorine meteors hit future earth at both poles, melting the ice caps, chlorinating the ocean into pool water and filling the air with chlorine gas. Most aquatic wildlife died, including oxygen producing algae. The oxygen content of the air decreased as it filled with chlorine gas. Between the unbreathable air and the collapsing ecosystem, the world became inhospitable for humans. Humanity decided to use its collective literal last breath to create a successor that could survive in the new world. As humanity died, it dedicated all its resources to a group of scientists that created the kemonomimi as human society collapsed. The kemonomimi grew in number as humans died off, leaving the kemonomimi alone in a world that had essentially become a giant swimming pool.

(This was the original concept for CATastrophe, and though it was discarded as the setting moved on to bigger and better things, some people still liked the idea of turning the world into a giant swimming pool)