I Went to Prehistoric Times to Be the Leader of the Clan

This is a human group that survived the slaughter of lich and was abandoned by the primitive people. Entering into a story of survival in a mirror world without saints or catastrophes, but based on the prehistoric times as a template. Perhaps one day, this group of people will return to the wild land. Human beings, who are as weak as ants, can make such waves in the great catastrophe of lich!