Kepler-01A is an Earth-like planet whose civilization has surpassed Earth through advanced technology and global unity. During a wormhole experiment, a young prodigy is accidentally sent to Earth. She wakes up in Japan and is captured by a secret facility known as the White Room, where children are raised and trained under extreme conditions. There, she meets Ayanokoji Kiyotaka and becomes part of the Fourth Generation. In a world of manipulation and control, her only goal is to survive-and find a way back home.