Primitive Civilization: A 175cm Dimensional Strike

An ordinary modern man—175 cm tall, with a bit of sanda training and a junior college diploma—is transported to a Stone Age where the average man stands two meters tall. Rather than relying on brute force, he uses his wits and modern knowledge to lead an ancient tribe from raw meat and blood to the pinnacle of civilization, and along the way marries a group of long-legged women all 178 cm or taller. — Description from novelcodex.org