She was converted into a patrol boat in 1940 and was lost during the Battle of Wake Island shortly after the beginning of the Pacific War in December 1941.

[3] The turbines were designed to produce 21,500 shaft horsepower (16,000 kW) to give the ships a speed of 36 knots (67 km/h; 41 mph).

The ships carried a maximum of 275 long tons (279 t) of fuel oil which gave them a range of 3,000 nautical miles (5,600 km; 3,500 mi) at 15 knots (28 km/h; 17 mph).

[5][6] Aoi, built at the Kawasaki Dockyard Co. shipyard in Kobe, was laid down on 1 April 1920, launched on 9 November 1920 and completed on 20 December 1920.

The ship was deliberately run aground on 23 December 1941 during the second Battle of Wake Island at coordinates 19°17′N 166°37′E / 19.283°N 166.617°E / 19.283; 166.617 to allow her Special Naval Landing Force troops to disembark.