廃遊園地のメメントメモリア

During the World War, children were forced to evacuate their homes.
The land where they gathered and lived became known as "lagoons".
Many "lagoons" are self-sufficient and provide a humane, albeit humble, way of life.

Kai, a young mercenary boy, lives in a "lagoon" that is an abandoned amusement park. During a joint operation with an adult-centered warlord called "The Army," Kai meets a girl, Her name is Mio. She has silver hair. She is not a talker. She is good at shooting. And she is a girl who can't wear bandages.