Invasion from Another World

Whether you believe it or not, that day is coming. From the countless doors that suddenly appeared in the sky, residents of another world invaded the ground with their majestic armies. The surviving humans signed a peace treaty with the intelligent races of the other world, and with their help, they built tall city walls and survived. The protagonist Xu Bugu is an orphan who lost his parents in the Day of Advent. This is his story in the end of the world with angels, orcs, elves, undead, dragons and other races from other worlds.