 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, uyeJapan yakapa chibvumirano chepamutemo musi wa2 September 1945. I-121 yakazvipira kuvaAllies muna September 1945 paMaizuru. 