Yoshitake Honda, also known as Cub, is a first-year student at the Yamakasa Institute of Technology in Fukuoka. He is a member of the school's Motorcycle Club and he lives in Ayaka-san's grandfather's garage. Working part time, he meets beautiful women such as Mieli, a cabaret girl in Nakasu, and Meeko, an internet idol. Now, the Cub must go into battle after a challenge from a mysterious street-racer on the Fukuoka Urban Expressway, but the true identity of the racer in black is......