The Earth was hit by 5 meteors 500 years, sending humans underground, underwater or in buildings called “arcology”. However, humans soon forgot how things were like outside of the utopia they lived in. Chihiro lives in Amahara, an arcology built on the land previously known as Japan. He had a passion for ‘flight’ motorsports and trained hard to be like his idol. But his idol died in an accident, and he lost his goal in life. Then one day, a ‘flight’ broke the walls surrounding Amahara, crashed to the ground in front of him and out stepped a golden-haired girl.