The excellent characteristics of the Tachikawa Ki-36 made it potentially ideal as a trainer. This led to the development of the Ki-36 with a single machine-gun. After successful testing of a prototype in September 1939, the type was put into production as the Army Type 99 Advanced Trainer.
In all 1,389 Ki-55 were constructed before production ended in December 1943 with Tachikawa having built 1078 and Kawasaki 311.
Francillon, Ph.D., René J. Japanese Aircraft of the Pacific War. London: Putnam & Company Ltd., 1970 (2nd edition, 1979. ISBN 0-370-30251-6.; 3rd edition 1987, Putnam Aeronautical Books. ISBN 0-85177-801-1.)