The Impenal Japanese navy ordered in early 1943 the Kawasaki plant to investigate the possibilities of building a flying boat measuring 300 tons According to the technical reports, her dimensions were to be an overall length of 162 meters, a wingspan of 180 meters and a height of 35.4 meters. The wing area was estimated to be 1,150 square meters. The gross weight was ao tons while she could transport up to 1000 soldiers or Imperial Marines with their ordinary equipment, and could deploy them anywhere in the Pacific.

Various details dealing with the supplied horsepower differ, some with the Ne20s turboprop engines suggested 2000hp a static thrust of 000 kg for one single engine, so with 12 engines 132.000 hp while another mentioned that each engine supplied 170 hp.

Instead of 12 turboprop engines, Ne330 Jet engines were suggested supplying totally 7/20 hp each. The range of the aircraft on a full load of fuel was 120 kilometers. Her crew would have numbered 24 men.

The aircraft was never completed, although several of the Ne20s turboprop engines were supplied and the air frame was under construction when the war ended.

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