Throughout her career, Yamaguchi was a regular for the Japanese rugby national team. She represented Japan at Asia Sevens in 2007, 2009 and 2010, Asian Rugby Union Game in 2008, Sevens World Cup in 2009, the Asian World Cup Qualification in 2009 and the Asian Four Nations in China in 2012. Yamaguchi was part of the Japanese rugby sevens national team that won silver in the 2014 Asian Games. Yamaguchi also took part in the 2016 Rio Olympics, in which she participated in the Rugby sevens event. Although Japan did not win any medals, Yamaguchi scored two tries against Kenya.