On March 10, 2003, the army conducts an experiment which is meant to shield military equipment from the effects of solar flares with the use of electromagnetic shields. But something goes wrong, and all soldiers assigned to the test suddenly find themselves stranded on a battlefield in the Sengoku period (the year 1547) and under attack by a samurai army. When the first men are killed, the unit retaliates with its formidable arsenal. And 74 hours later, a reverse effect occurs, and a wounded samurai warrior suddenly appears in the 21st century.