In the 22nd century, space travel, planetary colonization, and anti-gravity basketball are everyday realities, but Earth has become too hostile to live on, forcing humanity to reside in colonies on neighboring planets. During a school field trip, a series of unexpected events throws Luna, a newly transferred student, along with her robot companion Chako and six other classmates, into a gravity storm. They crash-land on what appears to be an abandoned planet. Taking charge as the group's leader, Luna, alongside the resourceful Kaoru, the privileged Howard, the timid Sharla, the accommodating Bell, the proud musician Menori, and the gifted Shingo, must struggle to survive. But is the planet truly lifeless, or are there hidden beings or individuals lurking in the shadows?