なぜ僕の世界を誰も覚えていないのか？ (Associated Names)

“Why does no one remember the true world?!” The era when the great race of the five tribes competing for hegemony on the ground ended with the victory of mankind led by the hero Sid. However, that world was suddenly “overwritten” in front of a boy named Kai. In the rewritten world, Kai saw the…