As for Hatsuharu-class, the removal of single-mount turret is more rare because most of the ships in this class were unable to survive to the modification.
Let's make Hatsushimo in this class for an example, since she survived until 1945.
Hatsushimo in 1939. Please note second aft turret still exist.
Another early war photo of this ship. From this angle that turret is clearer.
Hatsushimo in 1945. Look! She was just same as Shiratsuyus: the turret was replaced by flak platform.
