Kunimoto made his debut in the series' GT300 Class with apr on 2009 with Takuto Iguchi. the next 2 seasons he paired with Morio Nitta. The latter pair clinch 1 win and 4 podium during 2 season in 2010 & 2011.
Kunimoto then step up to GT500 with Kraft in 2012 with Andrea Caldarelli new to the series, as the pair clinch 1 podiun in the season. Kunimoto then moves to Team LeMans partnering Kazuya Oshima for three seasons. Both pair only won once from 2013, and five podiums. For 2016, Kunimoto moves to WedsSport Bandoh alongside Yuhi Sekiguchi.[3] He won only once on that season. After that he is the main driver for Bandoh for four seasons, with Kenta Yamashita, Sho Tsuboi, Ritomo Miyata, and Sena Sakaguchi as his teammate.[4][5][6][7] Kunimoto wins again with Sakaguchi in 2-23 at Suzuka Circuit. For 2024, he stays with the same team and teammate.[1]
Super Formula
Kunimoto made his debut in Formula Nippon in 2011 with Cerumo・INGING as a single car entry.[8] Kunimoto then won the series title in 2016 with his maiden two wins and four podiums, as he beats Andre Lotterer by three points. After that he did not win another title, and race till now. After eight seasons with Cerumo INGING, he moves to Kondo Racing in 2019, then KCMG.[6] For 2024, Kunimoto moves to Team Impul with Theo Pourchaire.[1]