Gyakushuu no Dragon Rider
逆襲のドラゴンライダー
A war has been ongoing on the floating island of Lithos, where three nations compete for dominance. The island's ability to remain airborne is due to a crystal, but its power is fading, increasing the danger of Lithos crashing. In response, each of the three kingdoms selects a top-tier soldier, known as a "Dragon Rider," to travel to the surface below in search of a peaceful land called "Arcadia."