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