Kinoshita began playing American football at the age of five, demonstrating early talent. He played in various positions: quarterback, running back, receiver, defensive back and on special teams, before settling as receiver at Ritsumeikan University, after his coach advised him that he would have the best chance in making the team if he stuck with that position.
College career
He attended Ritsumeikan University, where he majored in business administration and was a standout wide receiver for the Ritsumeikan Panthers. He helped his team reach four Koshien Bowls, winning three, and helping the Panthers win 2 out of those 3 Rice Bowl games. He earned Koshien Bowl honors three times.
Professional career
Amsterdam Admirals
He struggled throughout the 2005 season due to an injury early on, and difficulties with English conversation and crowd noise. He posted one reception for 12 yards and 21 yards on a single kickoff return. He was a member of the Admirals team that won the first World Bowl in their franchise history; World Bowl XIII. Kinoshita had a standout season in 2006, helping the Amsterdam Admirals ascend to a World Bowl XIV berth for the second year in a row. He led NFL Europa on kickoff returns with an average of 27.9 for a total of 530 yards in 19 attempts with a long of 82 yards, in addition to a 59-yard punt return for a touchdown as well as 12 receptions for a total of 188 yards as a receiver. He was named Special TeamsPlayer of the Week twice and selected to the all-NFL Europa team 2006 as special teams player. He returned to the Amsterdam Admirals for his third NFL Europa season. In 2007, Kinoshita led NFL Europa with a 15.9-yard punt return average and ranked third with a 23.2-yard kickoff-return average. He also added 23 receptions for 364 yards and two touchdowns in what would be the final season of NFL Europa.
On June 28, Kinoshita signed with his favorite team, the Atlanta Falcons, and competed throughout training camp for a roster spot. "I am very excited to compete at the Falcons' training camp with other great players," says Kinoshita. "It is exciting as a Japanese player to compete with American players, and I want to appeal to the fans in Atlanta. At the same time, I want to show the Japanese people how exciting the great game of football is." He was released by the Falcons at the end of training camp. On July 23, 2008, Kinoshita was assigned to the Falcons as an International Practice Squad player. Kinoshita is the only Japanese player of the 16 international players to sign onto NFL practice squads.
