To answer this question, the Mitsubishi JTM-1 was a jet trainer with swept back wings that was to use a 2,200 pound thrust turbojet (the prototype was to be powered by a Continental Marbore turbojet). See this link for info:
Mitsubishi JT-M1 trainer plan is hard to find.
In July 1953, Shin-Mitsubishi heavy industries, co.Ltd(新三菱重工) began to study JT-M1 trainer which planned to had JO-1 jet engine, side by side seats style cockpit and low wing loading value.
You can see tail part of JT-M1 in right side of this drawing.