3 decal variants:
1. Ki-61 I Otsu, 149th Shimbu Tai, Ashyia airbase, Japan 1945
2. Ki-61 I Otsu, 244th Sentai, Chólu airbase, Japan, August 1945
3. Ki-61 I Otsu, 244th Sentai, Corp. Matsumi Nakano, Japan, Dec 1945
The Hien comming at the frontlines in the summer of 1943 and fly in battles over New Guinea, Philippines, Okinawa and in the defense of the Japanese Home Islands. Over 3,000 examples of various Ki-61 variants were built. The Ki-61 I Hei was built in conjunction with the Otsu variant. In this variant, the wing machine guns were replaced by Mauser MG151/20 cannons. Total 388 Ki-61s were so modified. The first was completed in September 1943 and last was in July 1944. Max takeoff weight 3,470 kg, max speed 580 km/h at 5,000 m.