The Great War of Archimedes

Set in the 1930s, the headquarters of the Imperial Japanese Navy set out to build the world's biggest battleship Yamato. Rear Admiral Yamamoto Isoroku is opposed to that plan. Yamamoto attracts Kai Tadashi who is a genius mathematician. Kai discovers discrepancies related to the estimated cost to build the battleship. He tries to uncover a conspiracy in the military.
(Source: AsianWiki)