The ships had a range of 8,000 nautical miles (15,000 km 9,200 mi) at a speed of 16 knots (30 km/h 18 mph). The ships had two diesel engines, each driving one propeller shaft, which were rated at a total of 4,200 brake horsepower (3,100 kW) for a speed of 19.7 knots (36.5 km/h 22.7 mph). They displaced 880 metric tons (870 long tons) at standard load and 1,040 metric tons (1,020 long tons) at deep load. The ships measured 77.72 meters (255 ft 0 in) overall, with a beam of 9.1 meters (29 ft 10 in) and a draft of 3.05 meters (10 ft 0 in).

The Etorofu class was almost identical to the Shimushu class but with a simplified bow, stern and bridge structure to facilitate production. Despite simplification, the design was still too complex for mass production and one of the ships was not completed until early 1944. Production began between February 1942 and August 1943. However, sixteen of the projected thirty ships were subsequently re-ordered to the subsequent Mikura, Hiburi or Ukura designs. As the Shimushu class was not suited for mass-production and took too long to build, the 1941 Rapid Naval Armaments Supplement Programme authorized thirty modified versions of the Shimushu class, which were designated the Etorofu class. Immediately before the start of then Pacific War, the Imperial Japanese Navy suddenly decided to give more priority to convoy escorts, possibly in light of the ongoing successes of German U-boats against British shipping in the Atlantic. A new class of vessel was designed to use this loophole, and was given the obsolete designation of kaibōkan ( Kai = sea, ocean, Bo = defence, Kan = ship), which had previously been used to designate obsolete battleships which had been reassigned to coastal defense duties. One way in which the treaty could be circumvented was to use a loophole in the treaty which permitted ships of between 600 and 2,000 tons, with no more than four guns over 76 mm (3 in), no torpedoes, and with a maximum speed of no more than 20 knots (37 km/h 23 mph). The Shimushu-class kaibōkan, as with the Chidori-class torpedo boat, was a consequence of the 1930 London Naval Treaty, which placed limitations on the total destroyer tonnage the Imperial Japanese Navy was permitted. The class was also referred to by internal Japanese documents as the 'Modified A-class' coastal defense vessel ( 甲型海防艦, Kō-gata kaibōkan). Eight of the fourteen ships were sunk during the war. The Etorofu-class escort ships ( 択捉型海防艦, Etorofu-gata kaibōkan) were a group of fourteen kaibōkan escort vessels built for the Imperial Japanese Navy during World War II.

36 × depth charges initially, but later up to 60.Inoue has written episode scripts for anime such as Scarlet Nexus, One Piece, and Sword Gai: The Animation, with the latter title having been adapted from a manga originally written by her father. Her father stated that Akiko used a pseudonym to avoid being labeled as 'the daughter of Toshiki Inoue', though Akiko later went public with this after having already established a name for herself. After attending Senshu University, she wrote a story that received praise from her father, later becoming the writer for the Decade novel with his supervision. Inoue had always been interested in writing novels since she was a child. Writer for Kamen Rider Decade novel Akiko Inoue ( 井上亜樹子, Inoue Akiko) is a Japanese novelist and screenwriter who under the pen name Aki Kanehiro ( 鐘弘亜樹, Kanehiro Aki) wrote Kamen Rider Decade: The World of Tsukasa Kadoya ~The Garden Inside the Lens~.

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