[1] Despite competing in trampoline gymnastics, he is afraid of heights and will not ride roller coasters, and he does not enjoy the sport.

[4] He was initially not age-eligible for the 2020 Summer Olympics, but the one-year postponement of the Games gave him the opportunity to compete.

[1][4][11] With this routine, he won the silver medal in the individual event behind China's Yan Langyu due to a lower execution score.

[1] Nishioka returned to competition at the 2023 Coimbra World Cup,[3] but he did not advance beyond the semifinal round after finishing tenth.

[18] Then at the Varna World Cup, he won the bronze medal behind Chinese athletes Yan Langyu and Wang Zisai.

[5][22] During the qualification round for the individual event, he was unable to complete both of his routines, and he finished in last place and did not advance to the finals.