The Phoenix: Earthkeepers Chapter(火の鳥 アースキーパーズ篇)

The future earth where cities have been buried due to global warming and the environment important for humankind and life has been destroyed. One day, Kai, the hero who lives lonely without any friends to interact with, is led by the "Phoenix" and descends into the desert area of ​​the modern earth. What fate awaits Kai when he meets a girl there...