From a lowly 12th on the grid, GT500 rookie Hiramine drove a charging first stint in the #12 Nissan GT-R, gaining eight places inside the first 20 laps to sit in fourth position by the time he handed over the car to teammate Daiki Sasaki on lap 27 of 63.
But despite a strong start to his stint, Sasaki slipped behind the #14 Cerumo Toyota of Sho Tsuboi on lap 38, and then proceeded to fall all the way to ninth on the following lap.
By the time of the chequered flag, the Calsonic-sponsored Nissan had fallen to 12th, marking the Impul squad's fourth race in a row with no points.
Hiramine said he couldn't understand why Sasaki couldn't maintain his position, saying the #12 car - alone in the GT500 field in carrying no success ballast at Motegi - felt "perfect".
"Not much to say about the result," he told Motorsport.com. "Just a shit result as you can see. Our target is to score as many points as possible, but we couldn’t make it.
"Very disappointed. In my stint the car was good, the tyres were working well, warming up well, I was happy with the car. I’m just so disappointed with the result, out of the points again.
"I finished fourth in my stint, so we could have been P4, or even finished on the podium. I talked to Daiki, he told me, 'Sorry… but this is the race.' I don’t know what happened to him."
#12 Calsonic IMPUL GT-R