Air Gear

To escape gravity and transform the city into a huge playground, a new sport has emerged: Air Treck. A new kind of roller skates has been born. They incorporate an extremely powerful small engine. Ikki doesn't care about this discipline, until the day the Skull Saders, Air Treck enthusiasts, get involved. To defeat them, he will have to master Air Treck. Four sisters will be as unexpected as powerful allies.