Pedzisa mutsara unotevera: Musi waApril 20, 1945, "I-121" uye "I-122" vakadzoserwa kuSubmarine Division 33 muKure Submarine Squadron. "I-121" yakaendeswa kuMaizuru Naval Base musi wa12 Chikumi 1945 uye yakagara imomo kusvika pakupera kweHondo Yenyika II. Kurwisana kwakaguma musi wa15 August 1945, uye
Japan yakapa chibvumirano chepamutemo musi wa2 September 1945. "I-121" yakazvipira kuvaAllies muna September 1945 paMaizuru.