 The two Ibuki @-@ class cruisers were ordered in November 1941 as part of the IJN 's Rapid Naval Armaments Supplement Programme ( マル急計画 , 出師準備第一着作業建艦計画 Maru Kyū Keikaku , Suishi @-@ Junbi Dai @-@ Ichi Chakusagyō Kenkan Keikaku ? ) . Both ships were laid down without names , just as Warships No. 300 and No. 301 , but the former was named Ibuki on 5 April 1943 . 
