Career
She is the 2009 World all-around bronze medalist, uneven bars silver medalist, and a two-time Olympian (2008, 2012). The women"s gymnastics team placed 5th in team competition. Individually, Tsurumi placed 17th in the all-around final and 8th in the balance beam event final.
Tsurumi competed at the 2009 American Cup and placed 7th all-around.
Koko competed at the 2010 Japan Cup and placed second all-around behind Ksenia Afanasyeva. At that competition, Tsurumi scored a 15.400 on uneven bars.
She debuted a new bars routine with an ono turn to half turn connected to a Tkachev and an ono turn connected to a Jaegar. At the 2010 World Artistic Gymnastics Championships, Tsurumi experienced problems with consistency and failed to make any event finals and placed 21st in the All Around, behind countrywoman Rie Tanaka.
She placed 0.100 higher than 2nd place finisher, Chinese gymnast Sui Lu.
Later that year she placed seventh on Uneven Bars at the World Championships and seventh with the team In 2012, Koko was part of Japan"s Olympic team in London, where she placed seventh in the bars final and eighth with the team She made her elite comeback at the 2015 WOGA Classic in Plano, Texas, scoring 15.000 on bars and 13.850 on beam.
At the Nippon Hōsō Kyōkai Cup, Tsurumi suffered an achilles tendon injury and will be out for the remainder of the 2015 season.
lieutenant is unsure whether she"ll return to gymnastics.