The Agano-class was followed by the larger Oyodo class, of which only one vessel was completed.
Originally they were to have four 6.1-inch twin mounts but X turret was eliminated to allow a heavier torpedo armament and to save on costs.
The hull was flush-decked, and a bulbous bow was used for the first time on a Japanese warship.
The engines were a quadruple-shaft geared turbine arrangement with six boilers, developing 100.000 shp for a maximum speed of 25 knots. Like Yubari, the Agano-class had its stacks join into a single funnel.
As completed, the main armament was the same type of 152 mm (6 inch) gun as used on the Kongo class battlecruiser. This gun fired a 100-lb projectile . Secondary armament consisted of four 80 mm HA, which were actually 3-inch (76.2 mm) guns in two twin mountings. These guns fired a 13.2-lb projectile and were of unique size in the Japanese navy. The design was equipped with thirty-two 25 mm AA guns. The torpedo tubes were mounted on the centerline as was more common with destroyers, and had a rapid reload system with eight spare torpedoes. The design included a single catapult forward of the main mast, with stowage for two floatplanes. Depth charge equipment was also fitted.
In subsequent upgrades, the 25 mm anti-aircraft weaponry increased to 46 sets by 1944, and then to 52 sets and finally 61 sets by July 1944 on the surviving ships.
Completed on 31 October 1942, Agano participated in the battles for Guadalcanal and the Solomon Islands during 1943. Agano was badly damaged in Rabaul harbor by aircraft from USS Saratoga and USS Princeton, and in a subsequent attack by aircraft from TF38 on 11 November she received a torpedo hit. Ordered to home waters for repair, she was torpedoed and sunk north of Truk by the US submarine USS Skate, on 16 February 1943 .Noshiro
Commissioned on 30 June 1943, Noshiro participated in operations in the Solomon Islands and was damaged during the US carrier aircraft raids on Rabaul on 5 November 1943. She served in the Marianas in the summer of 1944, and was part of Admiral Kurita's force during the Battle of the Philippine Sea. At the Battle of Leyte Gulf in October 1944. She was west of Panay while withdrawing from the Battle off Samar on the morning of 26 October when she was sunk by aircraft from USS Wasp (CV-18) and USS Cowpens (CVL-25).Yahagi
Commissioned on 29 December 1943 Yahagi saw action in the Marianas in May/June 1944, during the Battle of the Philippine Sea, and during the Battle of Leyte Gulf. After the US invasion of Okinawa on 1 April 1945, she was ordered to accompany the Yamato on its suicide mission against the American fleet at Okinawa. Yahagi was hit by some seven torpedoes as well as a dozen bombs, and sank on the afternoon of 7 April 1945.Sakawa Sakawa was not completed until the end of 1944, by which time there was little fuel available, and she survived the war unscratched. After the war she was expended in the atom bomb tests at Bikini Atoll in 1946.