Return to Ancient Times and Reshape Civilization

I accidentally returned to the ancient times... The land was barren and lifeless... I was exploring the vast land like a primitive man, using my little knowledge to try to survive and create a new prehistoric civilization! In an extremely cruel natural environment, you stay with monsters and apes, with the sky as your cover, the earth as your hut, and your feet walking all over the world! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.