Today, there’ll be discoveries and encounters again. For the girls marching forward in a world in its afterlife, there are still various things to experience: The remains of an extinct civilization, other living things, as well as lessons taught by the ruins.. there is still a lot to be seen in the world. That’s why... living is still fun!

From Fairgame:

Fuu is a girl who was born as an elf/human hybrid, which caused her to be unwanted by either side. Fuu leaves her hometown and arrives at a place called "Limbo", a world where hybrids like Fuu gather. Day by day, Fuu's interactions with the residents of Limbo let her heart and feelings grow bit by bit.