[1] 23 October 1944, she left Kataoka Bay Naval Base, Shimushu Island, Kuril Islands for Otaru in convoy WO-303 consisting of transports Hokoku Maru and Umegawa Maru escorted by the destroyer Kamikaze and Etorofu-class escort ship Fukue.

[2][3] The transports are filled with naval personnel and fishery workers being removed to the homeland for the winter from the islands of Shimushu and Paramushiro.

[2] On 25 October 1944, she was torpedoed and sunk by the submarine USS Seal at 50°21′N 150°20′E / 50.350°N 150.333°E / 50.350; 150.333[2][4][5] west of the Kuril Islands.

She sank quickly in the frigid waters with 1,415 lives lost including 1,312 passengers.

[2] Seal evaded depth charge attacks by the escorts and the remainder of the convoy reached Otaru safely.