Ryo Hirakawa was able to convert pole position into a comfortable win in a 35-lap race which featured no mandatory pitstop and little in the way of genuine overtaking moves.
Kenta Yamashita was able to jump from third on the grid to second at the start ahead of Kondo Racing teammate Sacha Fenestraz, and briefly threatened Hirakawa for the lead in the opening sequence of turns on the first lap.
But Hirakawa was able to resist Yamashita's attack, and although he never extended his lead by any more than around 1.5 seconds, his victory never looked to be in serious doubt.
Podium: Ryo Hirakawa (Team Impul), Masahiko Kondo (Kondo Racing team director), Sacha Fenestraz (Kondo Racing)
In the closing laps the gap between the leading pair dwindled to as little as half a second, but Yamashita's late attempts to seize the lead using the overtaking system (OTS) came to nought as Hirakawa had also saved some of the extra boost.
"At the end it seemed Hirakawa and I both had some spare [OTS] capacity," said Yamashita, who was not allowed to take part in the podium ceremony after finishing second and was replaced on the second step by team boss Masahiko Kondo (pictured above).
"I was pushing the button all the time and wondering if there would be a chance, but Hirakawa also had some OTS left over and so it was totally impossible."
Fenestraz meanwhile regretted his poor start that cost him second, and said thereafter he never felt he had the chance to threaten teammate Yamashita.
But the French driver was happy to come away with a podium finish on his first Super Formula start, having suffered a difficult build-up to the race.
"The start was just not good, so I need to improve on that," said Fenestraz. "It was my first experience of the hand clutch, it was kind of difficult, and I lost second place.
"Then it was just trying to manage the tyres. [After the start] I didn’t feel like I had chance to overtake anyone, unfortunately.
"It was very difficult for everyone, big tyre degradation as I expected. It was kind of a hard race, and long, but happy to be able to finish on the podium in the first round."
Additional reporting by Tomohiro Yoshita
Sacha Fenestraz, Kondo Racing