After examining the situation, the crew realises that the ships they passed are part of the Imperial Japanese Navy and that they have somehow been transported back in time more than 60 years to June 4/5, 1942, the first day of the Battle of Midway. Knowing that an American attack will soon devastate the four aircraft carriers of the Kido Butai, some "Mirai" crew members believe that they should intervene, to save the carriers and the 3,000 Japanese lives that will be lost. With the "Mirai"'s advanced technology and weaponry, which is far superior to anything possessed by the United States (or any other nation) in this era, the crew realize that they could potentially alter the course of the Second World War. However, they agree that their top priority is to return home, and to ensure that they have a home to which to return they decide to do nothing that will change history.