In the summer of 1944 Ensign Mitsuo Ohta (transport pilot with 405th Kokutai) came up with the idea of a rocket powered suicide aircraft. With help of the Aeronautical Research Institute of the University of Tokyo plans were developed and then submitted to the Dai-Ichi Kaigun Koku Gijitsusho at Yokosuka. Masao Yamana, Tadanao Mitsugi, and Rokuro Hattori led a team that developed the final plans.
The Ohka was to be attached to a large aircraft, usually a G4M2e, which would then carry the Ohka near it's target and then release it.
Wood was the primary construction material of the Ohka.
The Ohka was designed to be flown by inexperienced pilots so the most rudimentary instruments were installed.
There were three solid propellant rockets in the tail. The pilot could fire them all at once or individually.