On December 31, in the individual final of the Japan Badminton Championships, there was an unexpected situation in the women's singles match. Due to Akane Yamaguchi's absence, Aya Ohori was in the semi-finals, and Okuhara wanted to retire in the final, which eventually led to the little-known player Sugi Kaoru successfully winning the championship. In the men's singles competition, Momota Kento performed well, successfully advanced and finally won the championship with an overall score of 2:1. As for the mixed doubles, Japan's Daiki Midorikawa and Natsu Saito defeated their opponents Kazuki Shibata and Saori Ozaki 2-0 on aggregate with a score of 11 to advance to the semifinals.
Yuki Kaneko and Misaki Matsutomo also passed easily, defeating their opponents Rinya Riki and Aoki Barrelda 2:0 with a score of 8, and the opponents only scored 15 points. Top seeds Kyohei Yamashita and Shinohaya Na stayed in the first game to defeat their opponents Daiki Nishiwa and Natsu Sato with a score of 10 and a total score of 2:1. In the absence of Arisa Higashino and Yuta Watanabe, Kyohei Yamashita and Naru Shinoya became the top seeds.
In the last game, Yuichi Shizomi and Ayakina Hohara also played three games, defeating their opponents Ogawa Ketsutai and Yoshikawa Tenno with a score of 12 and a total score of 2:1 and successfully advanced. In the mixed doubles semifinals, Yuki Kaneko and Misaki Matsutomo defeated Daiki Midorikawa and Natsu Saito with a score of 11 and a total score of 2:0 to successfully advance to the mixed doubles final. In the other semi-final, Kyohei Yamashita and Nana Shinohaya defeated teammates Yuichi Shizomi and Ayakina Hohara 2:0 on aggregate with a score of 18, and also successfully advanced to the final.
In the mixed doubles final, Kyohei Yamashita and Naru Shinohani faced Yuki Kaneko and Misaki Matsutomo, and the two sides were evenly matched. Although Matsutomo is an Olympic women's doubles champion, she is not very good in mixed doubles. In the first game, Yuki Kaneko and Misaki Matsutomo led the game 21-19. Subsequently, Kyohei Yamashita and Nanru Shinohani started a big reversal journey, winning the championship with a score of 14 and a total score of 2:1. In the end, the mixed doubles championship was successfully won by Kyohei Yamashita and Nanru Shinoya. The pair are the strongest Japanese mixed doubles pairs apart from Arisa Higashino and Yuta Watanabe.
Kyohei Yamashita and Nana Shinohaya stayed in excellent form at this year's Sudirman Cup, where they achieved impressive results in the semi-finals. In the first match, they defeated the national team Huang Dongping and Feng Yanzhe with a surprise victory, putting the national team in a difficult situation. Luckily, in the ensuing match, Liu Yuchen and Ou Xuanyi completed a stunning comeback, and it was Chen Qingchen and Jia Yifan who sealed the victory with a crucial shot.