By the end of the season, Nakamura-Berta was competing in the OK category, and he won his first OK title at the South Garda Winter Cup.

[8] At the end of 2023, Nakamura-Berta made an appearance at the final two rounds of the Formula 4 South East Asia Championship with Prema Racing.

[15] In the first half of the season, he only took one podium during the opening round in Imola, but was able to take his first win in a damp race in Paul Ricard.

[18] In Euro 4, Nakamura-Berta had a more successful campaign, racking up one win in Monza and ended third in the overall standings, as well as being the rookie champion.

[20] Nakamura-Berta continued in Formula 4 for his main campaign in 2025, remaining with Prema Racing to contest Italian F4 and the E4 championships with them.