Takumi’s job as a tofu delivery boy has turned him into one of the most formidable drivers around. Behind the wheel of his Eight-Six, he’s one with the road—and his life shifts into high gear when the underground street racing world takes notice. Drivers from across the region are lining up for a shot at the new guy. Takumi’s not just focused on winning—he’s out to prove he’s the best.

Gauche Suede is on his last delivery before a big promotion. In the outskirts of Yodaka, the darkest area of Amberground, Gauche is surprised to find that the package is a young boy named Lag Seeing. Lag had been traumatized by his mother's abduction and is due to be delivered to his aunt. In this remote area rife with Gaichuu, Lag and Gauche face a dangerous journey that inspires Lag to become a Letter Bee.

Two gutsy food delivery workers strive to overcome their socioeconomic disadvantages to achieve big goals -- and bump into love along the way.