[2] The following year, he contested the shootout for Honda's Suzuka Circuit Racing School [ja] scholarship, but lost out to current Formula 2 driver Ayumu Iwasa.

In Super Taikyū, he switched to the ST-TCR class, ultimately finishing as championship runner-up alongside Katsumasa Chiyo and mentor Hironobu Yasuda.

Okusa made another two cameos again at 2022 Formula Regional Japanese Championship with Sutekina Racing, claiming a win, a pole position, and three podiums.

He would ultimately take his maiden pole position and two more podiums throughout the season to finish third in the standings, three points behind the championship-winning car of Kondō Racing.

[4] Okusa makes his Super Formula debut with TGM Grand Prix, replacing the outgoing Toshiki Oyu at Suzuka Circuit.