There is a history of the plane here:
https://www.rafmuseum.org.uk/documen...aki-Ki-100.pdf
In the write-up is this:
"(The) Japanese ferry pilot
Sergeant Y. Kishi was found, and during interrogation disclosed that he had
delivered the aircraft by air some 2,500 miles from Japan (to Siagon) shortly before the
surrender, it being intended as a morale booster."