The project refers to two aircraft designs: the Ki-94-I and the Ki-94-II, both of which did not advance beyond the mock-up and prototype stage respectively.

The first was a twin-boom monoplane with two 1,641 kW (2,201 hp) Mitsubishi Ha211 18-cylinder engines, driving two 4-blade propellers in a push-pull configuration.

Notwithstanding the outstanding prospective performance, which however, was judged as "unduly optimistic" by the technical department of the Japanese Army Air Force, this design was judged too complex by the technical department, and the design was discarded.

[1] Intended to counter B-29 raids, it was optimized for high-altitude interception with a pressurized cockpit and heavy armament.

Only two prototypes were built in the event; the first was equipped with a single 1,895 kW (2,541 hp) Nakajima Ha219 [Ha-44] engine, driving a 4-blade propeller because the 6-blade one was not ready.