Zipang

The Mirai finds itself in the middle of the Combined Fleet formation of the night before the Battle of Midway. First, Mirai is signaled by the Yamato, the Combined Fleet flagship, then two destroyers attempt to block its path, but it successfully eludes the Imperial Japanese fleet using superior acceleration from modern gas turbine propulsion. Reluctantly, the crew realizes that they have traveled sixty years into their past, to the eve of the Battle of Midway. They witness the battle but make the difficult decision to not become involved so as not to affect history. Captain Umezu decides that, since they obviously cannot enter Pearl Harbor to reprovision as originally planned, they should head back to Yokosuka and hope that they may encounter the anomaly again on the return trip.

Kadomatsu rescues an Imperial Japanese Navy officer, Lt. Commander Kusaka, from a sinking seaplane. The Mirai’s crew is split over the fact that they may have changed history. The Mirai is discovered by an American submarine, USS Guardfish (SS-217).

The VTOL recon plane damages the two fighters and forces them to ditch without injuring their pilots, but its weapon systems officer is killed, the Mirai’s first casualty. Kusaka proposes that the Mirai go to Japanese-occupied Singapore, rather than Japanese mainland, to refuel and reprovision, He believes that he can arrange the resupply, armed with forged documents and fake currency produced on board the ship. Having examined Japanese Navy's personnel records in Mirai's record room extensively, Kusaka is certain that there is no one in Singapore who would recognize him.