Giant Fight!
This is an official statement aside from the data.
Legend has it that humans evolved from giants. Humans were initially considered a plague due to their frailty and were no match for others.
The giant's ruler ordered the death of these weak tribesmen, but the parents of the first humans were unwilling to kill their own children.
These giants banded together, taking the first humans with them to escape the Giant Kingdom and traveled a long journey to the East Continent.
After several thousands of years of procreation, humans thrived, becoming one of the rulers of this world, while the civilization of the Giant Kingdom was on the brink of extinction.
Giant Fight is a result of some strong humans researching ancestral powers.
During battle, the body height and physical strength increase significantly, but the degree of flexibility tends to decrease correspondingly.