The Kawasaki Ki-100 was a fighter aircraft used by the Imperial Japanese Army in World War II. The Japanese Army designation was 'Type 5 Fighter'. No Allied code name was assigned to this type.
The emergency measure of adapting a Ki-61-II-KAI fighter to carry a Mitsubishi radial engine resulted in one of the best interceptors used by the Army during the entire war. It combined excellent power and manoeuvrability and, although its high altitude performance against the USAAF Boeing B-29 Superfortress heavy bombers was limited by the lack of an efficient supercharger, it performed better than most other IJAAF fighters.
Operational missions began in March 1945. From the first engagements, the Ki-100 performed well against the B-29 and showed itself to be equally effective against U.S. Navy carrier fighters. A new variant, the Ki-100-Ib, was produced during the last weeks of the war in time to equip five sentai for home defense duties.