Sakai  

Smiley, スマイリー 酒井

"Smiley Sakai" is a driver and student at the Todo School who is friends with Daiki. He owns an Integra Type R DC2 that has been modified with an aftermarket turbocharger. During a hillclimb competition, he faces off against Keisuke from Project D. Despite his nervousness while racing, Smiley Sakai's nickname reflects his friendly demeanor and smile-like expression, making him stand out among other drivers.