He plays as a number 8 or flanker for the Japan national rugby team and Toyota Verblitz. Kikutani first played for the Japan 7"s team in 1999 and represented them at the 2005 Rugby World Cup Sevens before making his debut for Japan in November 2005 against Spain where he scored a try. He established himself in the side through 2006 but was ruled out of the 2007 Rugby World Cup with a knee injury.
After recovering from injury, he returned to the side and took over Takuro Miuchi as captain in November 2008 by coach John Kirwan and remained the Japan captain until the end 2011 Rugby World Cup.
He was singled out by Jones as one of the few Japanese players who has the attitude and physicality to be able to "smash" players. Kikutani is the second highest try scorer of all time by a forward with 31 tries, only Diego Ormaechea of Uruguay has scored more.
At domestic level, Kikutani has played all his career with Toyota Verblitz playing over 100 matches for them. He has twice been named in Top League team of the season in 2009/10 and 2012/13.
On 11 December 2013, Kikutani will officially leave Toyota Verblitz in Japan to join overseas in England with Saracens in the Aviva Premiership.