Units of the JGSDF's Special Operations Group were deployed in Japanese soil on a covert mission on orders from the Japanese Defense Agency. During the mission, the commandos are confronted with the worst enemy possible: Giant bugs ranging from Bees to Praying Mantises.

In addition to the huge insects, the SOG forces also need to go up against a pro-bug village and a scientist who may know why these mysterious creatures are roaming the countryside.