Kunimoto competed in the 2009 Formula Nippon season for Team LeMans, finishing last in the standings with one point.
Kunimoto joined A1 Team Korea for the 2008–09 A1 Grand Prix season, and was set to make his debut at the South African round, but political issues regarding a slogan on his car, prevented him from racing on that weekend.
[2][3] Kunimoto joined Epsilon Euskadi for the last two Formula Renault 3.5 Series rounds of the 2009 season.
He replaced Spaniard Dani Clos in the team's line-up at the Nürburgring and at the season finale at the new Ciudad del Motor de Aragón circuit.
[4] He returned with the team for the 2010 season, partnering 2009 Eurocup Formula Renault 2.0 champion Albert Costa.