Form: The perennial Asian champions, the Brave Blossoms often win the continental championship but find other opposition more challenging. Consecutive losses to the United States, Fiji and Tonga were followed by a win over Pool A underdogs Uruguay. Eddie Jones' side will be targeting a second World Cup victory when they face the USA.
Captain: Michael Leitch. The New Zealand-born back row is of Fijian descent and moved to Japan to study. He liked it so much he stayed and is now captain. He is returning to Super Rugby with the Chiefs in 2016.
Star player: Male Sa’u. Another New Zealand-born player, the centre or fly-half plays his club rugby for Melbourne Rebels. He starred in Japan's win over Wales in 2013.
World Cup history: Japan have qualified for every World Cup since 1987, but have never progressed past the pool stages. The defeat of Zimbabwe in 1991 remains their only victory, but their draw in 2007 against Canada was arguably a more unexpected and impressive result.
Japan’s Pool B fixtures:
Sat 19 Sept SOUTH AFRICA v JAPAN (Brighton Community Stadium, 4.45pm)