Natsu wakes up to find herself thrown out in the middle of an ocean. The last thing she remembers is going to sleep in her own bed. She finds she's with 7 strangers, and none of them remembers boarding a plane or a ship. The group gets stranded on an island full of strange plants and creatures. There, the "guide" explains to them about 7SEEDS, a government project to ensure humanity's survival, set into motion when scientists around the world predicted the destruction of earth. In Japan, 5 groups of 7 people, plus a guide for each group were put into cold sleep, only to be released when the climate is suitable for their survival. But when Natsu's group is confronted with the proof that they are indeed in Japan after some kind of catastrophe, each have to deal with the fact that life as they know it is over. No help is coming. They have to survive on their own on this land, where the environment has seemingly turned back to Jurassic times.