17-year-old high school student Sakura, along with 6 of her classmates, visits “Survival Land," a local theme park owned by Aoi's uncle. It is the setting for an interactive shooting game, with actors playing the roles of opposing ninjas, samurai, and gunmen. At first the girls are having a blast, shooting away at their enemies, until one opponent starts behaving strangely, attacking others for real... and spreading a strange virus that transforms its victims into crazed, bloodthirsty killers! The girls try to escape, but find themselves trapped within the park's enclosures. Sakura is forced to fight back - but can she survive?