Kojima learned to play soccer on the school team at Maebashi Ikuei High School . He signed his first contract with Urawa Reds in 2011 . The club played in the highest league in the country, the J1 League . For the club he completed 19 first division games. In 2014 he was loaned to the league competitor Tokushima Vortis . For the club he completed 11 first division games. In 2015 he returned to Urawa Reds. In July 2015 he moved to the second division club Ehime FC . For the club he completed 94 league games. In 2018 he moved to league competitor JEF United Chiba .