Following that competition, he set his personal best of 2.30 metres at the Twilight Games in Tokyo, making him the 6th-highest Japanese jumper in history.

[12][13][14] He didn't jump as high in the finals as he did in the preliminary round, claiming he was overworked.

[15] He ended his season at the 2023 Asian Games in Hangzhou, finishing tied for 2nd in qualification and 6th in the final.

[16] In February 2024, Akamatsu defended his Asian Indoor Championships high jump title in Tehran.

[3] He played basketball as a child, and the feeling of doing a layup inspired him to compete in the high jump.