[6] In January, Nishimoto reached his first BWF World Tour final, the 2018 Malaysia Masters.

He lost to home favourite and eventual champion Jonatan Christie in the semi-final, losing 15–21, 21–15, 19–21 in three games, winning a bronze medal.

[10] The following year, at the 2020 Thailand Masters, Nishimoto lost to Hong Kong's Ng Ka Long in the final, losing 21–16, 13–21, 12–21 in three games.

[11] In September, Nishimoto made it to his 7th career final, this time at his home event, the 2022 Japan Open.

After the final, Nishimoto stated that he was "really happy" and also "a bit relieved" after clinching his first title, and thanked the home crowd for their support.