In the year 2075, mankind has reached a point where journeying between Earth, the moon and the space stations is part of daily life. However, the progression of technology in space has also resulted in the problem of the space debris, which can cause excessive and even catastrophic damage to spacecrafts and equipment.

It is the 22nd century where anti-gravity and warp travel are commonplace. However, the green Earth only exists in history book, people live in space colonies instead. Luna is a transfer student whose parents passed away when she was young, leaving her alone with her robotic cat Chako. Her dream is to become space exploration expert like her parents. A mistake during a school trip strands her and six of her classmates on a seemingly uninhabited planet. Here she must lead the introvert Shaara, the mechanic expert Shingo, the quiet Kaoru, the spoiled Howard, the obedient Bell, and the prideful Menori in s battle for their survival.