Nakashima's first appearances at FIS races began in January 2003, in March of that year she started for the first time in the World Cup in Sapporo and finished sixteenth. Then she came in second place at the Japanese championships. In the following two years she took part in the World Cup, but mostly missed the top 10, while she often achieved good results in the lower-class FIS races and won once.
In the World Cup, Nakashima achieved her first successes in her specialty halfpipe in 2005, when she made it into the top ten several times in March and finally triumphed for the first time in December . After she proved her good performance in the course of the 2005/2006 season, she was allowed to compete in the Japanese team at the 2006 Olympic Games in Turin , where she also finished ninth.
After the successful winter 2005/2006, in which she became Japanese champion on the halfpipe and fourth in the halfpipe world cup , Nakashima started the 2006/07 season again strongly and achieved several good placements in the world cup. At the Winter Asian Games 2007 in Changchun , she won the gold medal in the halfpipe. At the end of the season, she was sixth in the halfpipe and 27th in the overall World Cup.
In the following 2007/08 season she only competed three times in the World Cup, but again reached top 10 placements. Nakashima won the first World Cup of the 2008/09 season . In the further course of the season she came in second place in Saas-Fee and in Stoneham and thus reached 16th place in the overall World Cup and second place in the Halfpipe World Cup. At the Snowboard World Championships 2009 in Gangwon , she finished fifth. The following year she became a Japanese halfpipe champion. She completed her last international competition at the 2010 Olympic Winter Games in Vancouver . There she came in 13th place.
Japan
World cup
