The year is 2017 in Tokyo, Japan, just three years prior to the city hosting the 2020 Olympic Games. Across the city, the Shutoko metropolitan highway system is undergoing dismantling and renovation, while new areas and facilities are being built, all at a frantic pace to finish the work in time for the Games. The Hyuga Corporation—a giant firm that succeeded in pioneering the practical application of artificial muscle fibers—is launching numerous products that supplement human muscle function and is experiencing a massive surge in profits. At its headquarters on National Route 246 in Tokyo's Gaien-mae district, Hyuga Corp. was secretly developing a powered suit that granted people with merely average physical fitness the superior skills and abilities of a very select group of professional athletes. This was all part of the company's plan to completely dominate its competitors and monopolize the industry. Dan Amo works in the General Affairs department of Hyuga Corp. By day, he is a nondescript salaryman, but at night, he relishes the sense of fulfillment his motorcycling lifestyle brings him. However, when night falls on Route 246, a group of mysterious riders in black suits frequently appears, and freelance journalist Makina Mikage is always on their trail. Another figure enters the scene: Kotaro Hyuga, the heir to the Hyuga Corp. presidency. The threads of an inescapable fate begin to draw these three young riders together...