In the final days of the war, "I-155" was selected for a "Kaiten" mission. Recommissioned in early August 1945, she was fitted with two "Kaiten" at Otsujima Naval Base and was scheduled to depart Hirao on 25 August 1945 with the submarine as part of the "Shinshu-tai" ("Land of Gods Unit") Kaiten group. However, Japan agreed to surrender to the Allies on 15 August 1945, and the operation was cancelled and "I-155" was recalled. Japan's formal surrender took place on 2 September 1945.