Ancestor of the Human Race: the Opening Battle Against the Saint

An otaku in the modern world, due to an accident, traveled through time and became a human ancestor in the prehistoric world. He was accidentally bound to the prehistoric human emperor system, and led the human race to conquer all directions, becoming one of the ethnic groups with the same life span as heaven [Multiple heroines + Nuwa + Invincible + Time Travel] (The first 10 chapters are a bit ink, if you want to read it, you can read it, if you don't want to, you can just skip the first 10 chapters)