The story is set on an archipelago of four islands far south of Japan or even the South Seas. It is all but a different world from modern Japan. From the discovery of anti-gravitons came the dream invention of anti-graviton shoes ("grash") that let people fly the skies. They introduce people to a new realm by enabling flight with just one's own body strength, without feathers or engines. This led to the rise of the sport of "Flying Circus" (dogfight race). The protagonist who once hoped for a future in this sport suffered a setback due to an overwhelming defeat, and withdrew from the sport for this and some other reason. However, he met the transfer student Haruka Kurashina, and in teaching her to fly the skies, the old passion returned. He takes part in the Flying Circus again. (Source: Anime News Network)

Meet Sefiria. She may be just a baby now, but she holds a dangerous secret - she has memories of her previous life as a Japanese salarywoman. After experiencing the hell of living in such a rigid society like Japan beforehand, Sefiria wants to avoid making that same mistake in her second life. That’s when she remembered a famous saying back in her previous life: “At ten years old, you can be a prodigy. At fifteen years old, you can be a genius. At twenty years old, you’ll just be a normal person.” While the new world she was born in considers adulthood to start at the age of 15, Sefiria has a repository of knowledge from her old life to help back her up. Can she become a prodigy at an early age, revolutionize her world, and ensure herself a slow life that any Japanese reader would love to self-insert into?