Takes part a while after Ikki accepts Simca's offer to become the new leader of Genesis. Shows the Battle between Kogarasumaru and Potemkine. Episode takes place between 21 and 22 of the Main series 

Ikki Minami is a junior high school student with a dream—to become the best Air Trek rider in town. It won’t be easy, as he faces a lot of competition from boys and girls alike. What is Air Trek? Just the latest craze that involves taking a two-wheel inline skate and adding a motor, suspension, and a shock absorber to enable the wearer to execute the wildest, wackiest, most aggressive moves you can imagine. Ikki has a lot to learn as he fights his way to the top in this wild, sexy manga from the creator of Tenjho Tenge!
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(Source: Kodansha USA)

Minami Itsuki never thought about seriously riding Air Treck motorized roller blades, until he got his butt handed to him by a street gang of Storm Riders. That day, he discovered in a locked up room, a pair of AT's and a box of stickers belonging to the Sleeping Forest street gang. One thing leads to another, and Ikki dons the wheels and begins to ride. As his reputation builds in the AT street fighting/racing world, he begins to develop his own gang and participate in more fights, gaining more and more territory. 

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