The Future Stares Back
After a meteor strikes the Earth and a large chunk of the population gets wiped out, the remaining humans undergo rapid evolution in order to survive rising sea levels and much harsher temperatures. Decades later, the daycare attendant wakes up from an emergency shutdown. Desperate to navigate the new world and find a sense of purpose after everything they've ever known was ripped away from them, Sun and Moon eventually stumble upon one of these evolved humans.
You. A mer on land and very far from home.
With no way of understanding each other, the three of you now have to work together to survive.