(Similar size ship)
Tabular Record of Movement
© 2017-2018 Bob Hackett
28 July 1937:
Osaka. Keel laid down at Osaka Tekkosho (Iron Works) K.K. Sakurajima Kojo (Yard) as Yard No. 1328, a 1,535-ton cargo ship for Dairen (formerly Port Arthur) Kisen K. K. (D.K.K. Line) of Manchukuo (Manchuria)(now Dalian, China).
25 October 1937:
Launched and named KOGA MARU.
15 December 1937:
E 1938 ~ 1945?:
Placed on D.K.K.'s Dairen ~ Tsingtao ~ Shanghai route. KOGA MARU was probably operated civilian until late in the war.
Requisitioned by the Imperial Japanese Army (IJA). IJA number and date unknown.
15 May 1945 :
KOGA MARU departs Otaru in convoy "He" also consisting of SHICHIYO and TETSUYO MARUs escorted by kaibokan CD-47 and CD-205.
19 May 1945 :
Arrives at Kataoka Bay, Paramushiro.
26 July 1945 :
Kuriles. At about 0300, Reserve LtCdr James L. Hunnicut's USS CARP (SS-338) fires two torpedoes and gets one hit that stops KOGA MARU's engine. CARP loses the target's radar pip at 45-10N, 145-28E, One crewman is KIA. 
Authors' Notes :
 Not to be confused with auxiliary stores ship KOGA MARU.
 Japanese author Komamiya Shinshichiro says KOGA MARU was sunk by aircraft on 31 July 1945.
Thanks go to Erich Muehlthaler of Germany.
to IJA Transports