A very interesting photo mate!
Like the Irish I too thought it was some sort of Russian tail-dragger, a Yak or even an experimental Lavochkin with the cockpit way at the back, but there's no sign of a jet exhaust outlet at the bottom of the fuselage? No luck there, so off to Germany for a quick look at Messerschmitt's 209 machines. Nothing similar there either, so late last night I went to Japan briefly - looking at those experimental machines with the cockpit further back and big engines - again no luck. Went to bed.
So this morning I had a closer look at your photo and I think I'm seeing more detail in the light...
It's now looking a lot like the Yokosuka R2Y? - but I'm not sure why I don't see a pilot's head in the cockpit?