6 August 1945:
Colonel (later BrigGen) Paul Tibbets' Boeing B-29 Superfortress heavy bomber "Enola Gay" drops "Little Boy", the first atomic bomb, on Hiroshima, Japan. The explosion wipes out 90 percent of the city and immediately kills about 80,000 people; tens of thousands more later die of radiation exposure.
7 August 1945:
LtCdr Takaoka Susumu pilots the Kikka's first 20-minute test flight. The aircraft performs well, the only concern being the length of the takeoff run.
9 August 1945:
Major (later MajGen, MA NatlGuard) Charles W. Sweeney's B-29 "Bockscar" drops "Fat Man", the second atomic bomb, on Nagasaki killing between 80,000 and 100,000 people.
11 August 1945:
For the Kikka's second test flight, rocket assisted take off (RATO) units are fitted to the aircraft. The pilot is uneasy about the angle at which the rocket tubes are set. With no time to correct this, it is decided to simply reduce thrust of the rockets from 800 kg to only 400 kg. Four seconds into take off the RATO is actuated. It immediately jolts the aircraft back onto its tail leaving the pilot with no effective tail control. After its nine-second burning time, the RATO runs out, the nose comes down and the nose wheel contacts the runway resulting in a sudden deceleration. Since both engines are functioning normally, the pilot opts to abort take off. While he fights to brake the aircraft and perform a ground loop, the Kikka runs over a drainage ditch which catches its tricycle landing gear and tears it off. The aircraft continues to skid forward and stops short of the water's edge.
15 August 1945:
Before the Kikka can be repaired, the Emperor and Japan unconditionally surrender. All work on the Kikka ceases. At this time, the second prototype is near completion and Nakajima has 23 more airframes under construction.
Aircraft under construction at Nakajima plant, 1945 - foreground-Kikka
jets, background-G8N Renzan heavy bombers.
Kikka beneath B-29 "Enola Gay" at Stephen F. Udvar-Hazy Center, Chantilly, VA.
 The Kikka is often identified as the Nakajima J9N1, or occasionally J9Y, which is incorrect. Like other Japanese aircraft intended for use in suicide missions, it received only a name.
 Although the Kikka resembled the Me-262 in layout and shape, the Japanese jet was considerably smaller and slower. For example, the Kikka's wingspan was 32' 10" while the Me-262's was 41' 6" and the Kikka's length was just 26' 8" vs. the Me-262's 34' 9". Fully loaded, the Kikka’s maximum speed was 432 mph vs. the fully loaded Me-262's maximum speed of 540 mph.