The Blue... axolotl?

15 years after the apocalyptic rapture that destroyed the world, a seemingly half axolotl, half human girl named Nixie wakes up with no memories of how she got there, where she came from, or even what she is! The only thing she remembers is her name, and that she has to look for someone. As Nixie traverses this world and discovers old ruins and new friends will she learn the true danger before it's too late? Or will Nixie disappear the same way the fist people of this land did?