The Mitsubishi Q2M "Tai'yō" (大洋, Great Sea) design was derived from the Mitsubishi Ki-67-I Hiryū ("Peggy") heavy/torpedo bomber of the Japanese Army and its Naval variant, "Yasukuni". It was ordered for design and construction in the last stages of war.
Powerful engines of would have been used to drive five-blade propellers. Such an aircraft would have been managed by five or six crew. Due to technical troubles and a long development of the theoretical design, this aircraft did not advance from paper plans in last days of conflict.