Silent Service

Moments after an atomic bomb falls over Hiroshima, a secret Japanese submarine sails into battle against its American counterpart, and both are lost to history. Some fifty years later, a special UN task force sent to investigate unusual phenomena in Antarctica is threatened by a mysterious black cylinder.

In Kyokujitsu no Kantai, Japan builds up on its success in the earlier series by expanding its blue-water capabilities to reach the Atlantic Ocean, challenging the Kriegsmarine in the process. Nazi Germany also launches a surgical strike on the White House and the Japanese fleet repels a German invasion of Britain.

Konpeki no Kantai is a Japanese alternate-history original video animation series produced by JC Staff. Based on a 1992 novel by Yoshio Aramaki, the series focuses on a technologically advanced Imperial Japanese Navy and a radically different Pacific War that was brought about by Admiral Isoroku Yamamoto's revival in the past due to unexplained circumstances. The series also features real-life 1940s figures whose first names were changed, such as Winston Churchill to Kingston Churchill and Adolf Hitler to Heinrich von Hitler.

It is the year 2201. The Yamato has returned from the devastating battle with Emperor Zordar and the Comet Empire. Sanada, Aihara, and Shima are released from the hospital, and go to pay their respects to the fallen crew members at Okita's memorial. They meet Tokugawa's son Tasuke, who says that he will be joining the crew once he graduates from cadet school. The next day at his graduation, he ends up capsizing a boat full of new cadets because they are all too busy staring at the Yamato to watch where they are going. After some problems during launch due to the new engine crew hitting the wrong switches and stalling the ship, the Yamato departs on what should be a simple training mission.