Nagamine took part in the Nordic Junior World Ski Championships several times , but did not succeed in winning a medal. His best result was sixth place in the team competition together with Yoshihiro Kimura, Yuto Nakamura and Ryota Yamamoto in 2015 in Almaty . In individual competitions, seventh place in the Gundersen competition on the normal hill with a subsequent cross-country skiing distance of five kilometers at the 2017 Junior World Ski Championships in Soldier Hollow is his best result. He had his first competition in the Nordic Combined Continental Cup on Completed March 6, 2015 in Tchaikovsky , Russia . He achieved his best result so far in this competition series on January 15, 2017 in Kuusamo in sixth place. On February 10, 2017, he made his debut in the World Cup in Sapporo with a 21st place.