In the 22nd century space travel, planet colonization and even anti-gravity basketball are commonplace. Planet Earth has become uninhabitable though, and therefore people live in domed-off colonies on the other planets.

On a school field trip, a human error causes a young transfer student named Luna, her pet robot, and six of her classmates to be engulfed by a gravity storm, forcing them to crash land on a seemingly uninhabited Earth-like planet.

There, with Luna as their leader, her robot cat Chako, the lone wolf Kaoru, the spoiled rich boy Howard, the shy Sharla, the obedient Bell, the prideful musician Menori and the young genius Shingo must fight for their survival. But is the planet really uninhabited, or is there someone or something out there, waiting in the deep shadows of the dense forest?

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