When he was a child, Murakami was friends with a girl he called Kuroneko. One day, while trying to prove the existence of aliens to Murakami, she is killed in an accident that he barely survives. Guilty of his role in the accident, Murokami decides to dedicate his life to proving that aliens exist. Then, one day, a new student with mysterious powers transfers into his class who not only looks a lot like Kuroneko, but is named Kuroha, Neko.
In the Four Islands Archipelago, people can use Grav-Shoes to fly around! This is the story of Asuka Kurashina, a transfer student that arrives at Kunahama Academy from outside the Four Islands. After seeing the ability of wearers to soar in the sky, she quickly develops an interest in flying with the Grav-Shoes and also joins the school’s FC (Flying Circus) club to further her passion.