Ten thousand feet above the sea of clouds. Between the raging currents and the freezing azure firmament, the wyvern with crimson wings, Guest, found their only home.

The region humans call the "Celestial Corridor" is ruled by constant violent storms and unobstructed sunlight. In this world, severed from the heavy mud and conflicts of the earth, they live simply by surrendering to the wind, feeling the swell of the currents at the tips of their wings.

Their blood-colored scales, once feared by those who crawl the earth as a "Calamity of the Sky," have weathered thousands of storms to become a tough armor reflecting the dazzling light. Spread beneath them is an endless carpet of clouds. The cliffs and oceans that represent barriers to terrestrial creatures are to them merely fragments of a landscape.

However, one day, an anomaly visits the sky journey that seemed destined to last forever. From a break in the clouds far below, from the human realm that should never have intersected, a pillar of light like a pale blue signal fire pierced toward the heavens.

It was a call that stirred forgotten memories of the earth and set the gears of a new fate into motion without error—.

How shall the continuation of this story unfold? (For example, an encounter with humans on the ground, or a battle with a rival for aerial supremacy?) Whether you descend to the earth to destroy a kingdom or head toward the horizon to reach the edge of the sky, the choice is yours!