To All of Humanity

When Kyouka Shintou awoke from a long and hazy dream, it was in a devastated Akihabara.

Mysteriously, there was no one around her but her close friends. Kyouka and her friends decided to lead a self-sufficient life in order to live in an uninhabited city. "Every day we work together through trial and error to build a comfortable life, little by little."