The story unfolds across a group of four islands, located far south of Japan and the South Seas, creating a distinct world from present-day Japan. The scientists' revolutionary discovery of anti-gravitons led to an intriguing idea of anti-graviton footwear, which enabled people to fly through the skies without the need for wings or engines. With this, a new sport known as "Flying Circus" was born, allowing individuals to explore an uncharted realm solely using their physical strength. Despite the protagonist's fervent desire to excel in Flying Circus, they suffer a significant setback, which causes them to retreat from the sport for multiple reasons. However, when Asuka Kurashina, a transfer student, seeks their help to learn how to fly, the protagonist's passion is reignited, and they return to Flying Circus.