Konpeki no Kantai(紺碧の艦隊, lit. Deep Blue Fleet) is a Japanese alternate-history original video animation series produced by J.C.Staff. The series focuses on a technologically advanced Imperial Japanese Navy and a radically different World War II that was brought about by Admiral Isoroku Yamamoto's revival in the past due to unexplained circumstances. The series is also notable for using the Imperial Japanese calendar instead of the Roman calendar in denoting the years where the events of the series take place. It also spawned a 1997 OVA sequel called Kyokujitsu no Kantai(旭日の艦隊, lit. Fleet of the Rising Sun), one manga sequel, and two turn-based strategy games for the PC-FX and the SNES.