Hundreds of years ago, desire gave rise to the Mana ecosystem that almost wiped out humanity. Humans instantly became prey, civilization was destroyed, and suspicion and fear in the doomsday widened the distance between people. In the face of disaster, people gradually realized that emotions - the existence that was considered taboo by the lighthouse, has now become the strongest bond to break through all obstacles and build a community with a shared future. Can the survivors who have been forced into a desperate situation regain the future?