Kirinchou Boueigumi

The time is the near future...

A series of kidnappings of elementary school girls were occurring frequently throughout the country.

With kidnapping cases increasing day by day, measures were urgently adopted to enable girls to protect themselves. To achieve this, "reinforced suits specifically for elementary school girls" were developed. Although mass production was abandoned due to cost considerations, four suits were distributed to every elementary school nationwide.

Brave girls clad in reinforced suits protect their respective school districts...people call them the "Defense Squad."