It is the 21st Century. Survival games continue to fascinate fans all over the world. It has become a national sport in Japan as well. The stage is Shodoshima. Mari Fujisaki, a first-year high school student will once again aim for the top of the nationals with her friends in a survival game that she thought she all but gave up on. The summer really starts to heat up for these girls who are training for survival...it's guns and girls!