A member of the TGR Driver Challenge Program, Kobayashi won the F4 Japanese Championship in 2023.

He continued to compete for the 2023 season, and he won the title ahead of Jin Nakamura and Yusuke Mitsui.

On 30 May 2023, Toyota Gazoo Racing announced that Kobayashi took part in WEC Challenge Program training session for young drivers who are deemed to have a future in the Le Mans 24 Hours.

He participated and experienced firsthand how WEC drivers and engineers take on the challenge of Le Mans.

[4] Nakamura also will make his debut to compete in Super GT - GT300 with apr, as he will partner Hiroaki Nagai and Manabu Orido.