[1][2] He reached the quarter-finals of the men's singles WH1 at the 2020 Summer Paralympics but did not advance to the final four.

He also reached the semi-finals of the men's doubles WH1–WH2 event with his partner Takumi Matsumoto but eventually lost in the bronze medal match.

[4] Nagashima was an active badminton player during his years in junior high school.

During his university years, he suffered a spinal cord injury in an accident and became wheelchair-bound.

He later discovered wheelchair badminton and started to compete in international para-badminton tournaments.