A group of three Japanese ships set sail towards South America in the year 200X, but a storm halted the convoy of JDS Mirai. The ship was inadvertently transported to the year 1942, and had to navigate its way towards Midway Island, where a significant naval battle between the American fleet and the Allies took place. The crew of the Mirai faced a crucial decision - whether to interfere with the outcome of World War II or not.