Nakajima Ki-49 (Helen) Type 100
The Donryu started its operational career in February 1942 with a series of high altitude raids on the Darwin and other targets in Australia.  

Intended as a replacement for the Ki-21 Sally, it fell short of preformance expectations and served alongside them.

Ki-49's were better armored, carried substantial defensive armament, and had self-sealing fuel tanks. It was the first Army bomber with a tail turret.

The Ki-49-II model was at one point the most widely used JAAF bomber, also used in transport and antisubmarine and later kamikazie roles.

Production
A total of 819 were built.