"isuzu" underwent a number of wartime modifications to increase her number of anti-aircraft guns, and to replace her twin torpedo launchers with a single quadruple aft mount. from may – september 1944, she was converted into a dedicated anti-aircraft cruiser, during which her entire main battery, torpedo launchers and aircraft catapults were removed, and replaced by three twin-mount 12.7 cm/40 type 89 naval guns, and a type 94 high angle fire control system and type 13 and type 22 radars were added.