Update. About production number.
Ki-61 II---8
Ki-61 II Kai prototype---30
Ki-61 II Kai---99,other 275 fuselages install the Ha112 engine become Ki-100.
The mass of Ki-61 II was deployed in 56th sentai.
Ki-61 II got good high altitude performance,but again the Ha140(1500hp) was a problem.
