Morizumi was a graduate of the 22nd Naval Engineer Academy class. He began service as a Midshipman/Engineering on 15 December 1913 aboard training cruiserTsugaru. On 18 July 1914 he was assigned to the Armored cruiserTsukuba, with promotion on 1 December to Engineer Sublieutenant (Ensign).[2]
On 7 February 1917, Morizumi transferred to the Ume, one of the ten Kaba-class destroyers hastily (but well) built by seven Japanese yards to fulfill Japan's allied commitments in the Great War. On 20 February 1918, he was assigned as Assistant Staff Officer of the 2nd Special Task Fleet, a task force of Japanese destroyers deployed to Malta in the Mediterranean as part of Japan's assistance to the Allied war effort under the Anglo-Japanese Alliance.[4]
When the war ended, Morizumi was the Osaka naval defense district superintendent of shipbuilding and ordnance.[6]
Death
He committed seppuku, ritual suicide, in his office in Tokyo on the night of 3 September 1945, the day after Japan's unconditional surrender to Allied forces.[7][8][9]