
Toyota junior Koyama, the reigning Formula Regional Japanese champion, is registered as the third driver for the Arnage Racing-run #50 Lexus RC F GT3 alongside Igor Fraga and Yuga Furutani for the Fuji 450km on May 4.
Both Fraga and Furutani were able to complete the rookie test in the opening official pre-season test at Okayama earlier this month, but rainy conditions in the subsequent test at Fuji scuppered attempts by Koyama to clear hers.