Type I: Pulsejet intake located above and behind the cockpit, droppable landing gear. Intended for conventional take off on own power (possibly with the help of droppable rocket boosters).
Type II: Similar to Type I, but with pulsejet moved forwards, no landing gear. Intended for submarine launch.
Type III: Pulsejet mounted ventrally, no landing gear. Presumably, this version was intended to be air-launched by medium bombers such as the Mitsubishi G4M, Nakajima G8N or Yokosuka P1Y.