The picture below shows a Ki-61 variant, but if you look closely on the wing, there is a (gun?) long metal rod attached to it.
I think it’s a gun but that wouldn’t be your standard Ki-61; so what variant could it be?
According to the source the picture might be taken in China after the war, what the source said:
This Ki-61 photo was more likely taken in CHINA after the war.
Below is one taken at CLARK from No.19 Hiko Sentai.
“Jim Lansdale”
Spoiler
Source: