Maj Teruhiko Kobayashi in his Ki-61. Note the 6 B-29 kill markings. The last one, crossed by a silhouette of his Ki-61, indicates his ramming of 27 January 1945.
Improvement of the basic model led to the Ki-100-II, with a turbocharged engine for high-altitude interception of the B-29 Superfortresses, but only three examples were built, and it never saw combat.