German Fighters in Japanese service? I don't think so. The Germans and Japanese had different philosophies of combat. As far as I know the Japanese received seven examples of a Bf 109E-7 in June 1941. They were used in comparison test against captured examples of Curtiss P-40Es, prototypes of the Kawasaki Ki 61, Nakajima Ki 43 and Ki 44. Apparently after the test results were tabulated the Japanese had no interest in the Bf 109s.