The
Ibuki-class heavy cruisers did not make an appearance until May 1944, by which time they were sorely needed in terms of heavy cruisers. By this time, Japan had lost forty percent of its prewar heavy cruisers (
Tone at the Battle of the Hawaiian Islands,
Mogami and
Mikuma in the disaster at Midway, and
Furutaka,
Niitaka,
Aoba,
Kinugasa, and
Chikuma during the Solomons campaign), and - though some remained eternally optimistic that the war would end in a Japanese victory - it was doubtless that more losses would come soon.
Ibuki as completed, May 1944:
Rushed to the front lines, she completed her shakedown cruise en route to the fleet anchorage at Tawi Tawi, and upon arrival continued training her crew at anchor. She participated in the Battle of the Philippine Sea, where it was determined that the class needed more antiaircraft protection; this was incorporated into her sisters as they were commissioned:
Kurama in late June 1944,
Komaki in early August, and
Asama in mid-September.
Asama in October 1944:
All four ships participated in the Battle of Leyte Gulf, which savaged Japan's heavy cruisers; in the course of three days,
Myoko,
Maya,
Chokai,
Hirado,
Takasago,
Suzuya, and
Azuma were all sunk, with
Nachi and
Kumano added to the tally the following month. Incredibly, all four
Ibukis survived the holocaust in the Philippines intact, the only class of cruiser to do so.
Kurama in April 1945:
Kurama was sent out with the
Yamato task force to Okinawa, and was sunk with the other heavy ships in the task force. With the losses of
Haguro in May and
Ashigara in June, Japan's heavy cruiser force was rapidly dwindling. Finally, in July 1945, the U.S. Navy launched a massive air strike on the remnants of the Japanese fleet, sinking both
Hakone and
Ibuki, along with light cruisers
Oyodo and
Nayoro, large cruiser
Iwate, battle cruiser
Haruna, and training carrier
Shimane Maru.
By February 1946,
Komaki and
Asama, the last of their kind in the Japanese Navy, had been rearmed thus:
The most notable difference was that all aircraft handling facilities had been removed and more antiaircraft guns added. However,
Asama struck a mine and sank in the Inland Sea in June, leaving
Komaki as the sole surviving Japanese heavy cruiser. In August, she greeted U.S. forces alongside battleships
Nagato and
Kawachi in Tokyo Bay, and would go on to have a long and proud career in Japan's post-war fleet.