is a Japanese professional stock car racing driver who currently competes full-time in the ARCA Menards Series, driving the No. 12 Toyota Camry for Fast Track Racing. He has previously competed in the NASCAR Xfinity Series.
Koga began competing in NASCAR in 2001 in the NASCAR Northwest Series, where he attempted six races, qualifying for five and failing to qualify for one. After competing in partial K&N West Series schedules between 2002 and 2016, Koga ran his first full season in 2017. That year, he also scored a career-best fifth-place finish at Orange Show Speedway. In December 2018, Koga announced he would be joining Performance P-1 Motorsports for the 2019 season. He remained with the team for the 2020 season in the renamed ARCA Menards Series West. Koga left Performance P-1 for the 2021 season, and joined Jerry Pitts Racing to drive their No. 7 car full-time, which switched from Ford to Toyota starting that year. The team was formerly Jefferson Pitts Racing before the team's two co-owners, Jeff Jefferson and Jerry Pitts, split up to each have their separate teams.
On February 21, 2022, an article from Yahoo! Japan revealed that Koga would attempt to make his NASCAR Xfinity Series debut at some point in 2022, driving for MBM Motorsports. However, this did not end up happening.
On January 30, 2025, Koga moved to the ARCA Menards Series East where he would run the No. 12 Fast Track Racing Toyota for the full season. Later that year, it was revealed that Koga would make his Xfinity Series debut driving for Joey Gase Motorsports with Scott Osteen in the No. 53 Toyota. He was not entered for Dover, but he did, in fact, enter for Portland, but in the No. 35, where he finished in 29th.
On December 12, 2025, it was revealed that Koga will drive the full ARCA Menards Series schedule, driving the No. 12 for FTR.
() (<span style="font-size:85%">Bold â Pole position awarded by qualifying time. Italics â Pole position earned by points standings or practice time. * â Most laps led.</span>)
() (<span style="font-size:85%">Bold â Pole position awarded by qualifying time. Italics â Pole position earned by points standings or practice time. * â Most laps led.</span>)
Season still in progress