In the year 2115 of the Fortress Era, a female major named Weiqin, who was born in the border troops, came to the Central Fortress to participate in the selection of the Chosen Ones. She was repeatedly assassinated for secretly investigating the "Border Tragedy". At this time, the Fortress's number one public enemy, Yuanyi, instigated a bizarre and massive resistance action. For a time, all forces were involved in this action.