In the year 200X, a Japanese fleet comprising 3 vessels departs on a mission to South America. After encountering a storm, the ship JDS Mirai finds itself separated from its escorts and transported to 1942, heading toward the island of Midway to confront the American fleet in one of the largest battles in naval history. The crew of Mirai must decide whether or not to alter the course of history by intervening in WWII.