Completed and commissioned in December 1944, she served during the final months of World War II, making two supply runs.

[1] For surface running, the boats were powered by a single 400-brake-horsepower (298 kW) diesel engine that drove one propeller shaft.

[3] Ha-102 was laid down on 8 June 1944 by Mitsubishi at Kobe, Japan, as Small Supply Submarine No.

[4] In mid-January 1945 she conducted workups with her sister ships Ha-101 and Ha-104 in the Iyo Nada in the Seto Inland Sea.

[4] She was reassigned to Submarine Squadron 7 in the 6th Fleet on 10 February 1945[4] and in mid-February 1945 departed Yokosuka, Japan, to take part in a series of exercises with Ha-101.

[4] On 5 April 1945, she got underway from Yokosuka to make her first supply run, a voyage to Marcus Island, which she reached in mid-April 1945.