In the year 22XX, Earth's human population has fallen sharply, so the government welcomes races from allied planets. Mixing between these peoples gives rise to new species with special powers. On his eighteenth birthday, Yuuki learns that his father belongs to the hero tribe. His mother came from a tribe able to control plants, believed wiped out as the planet grew ever more mechanized. Holding the powers of both, Yuuki must decide whom to help and whom to fight. The story is a science fiction film.