Originally laid down as Ibuki / Suzuya / Mogami class cruiser on April 24, 1942, it decided to make her as a high speed oiler. However that was never done and in November 1943 the hull went to the Sasebo Navy Yard to be made into an aircraft carrier. The flight deck had been added on top of the hangar by late 1944.
Construction continued slowly until March 1945 at which time the Ibuki was abandoned with it only about 80% completed. The Japanese Navy felt that suicide craft were more urgently needed.
As the conversion to an aircraft carrier started six of the boilers were removed to make room for oil.
There was a single hangar.
The flight deck had two elevators.