The S-shaped curved bow introduced on the "Mutsuki" class was retained; however, the well deck in front of the bridge was removed, which made it possible to extend the forecastle further aft and to flare the hull back to the first stack, which increased seaworthiness. The forecastle was also raised one deck in height to reduce the effect of heavy seas on the forward gun mount. The bridge enlarged and enclosed. The bow was given a significant flare, to offer protection against weather in the Pacific.