Troisième humanité
The story begins with an archeologist discovering a giant human bone buried underneath the Antartica. He believes that there was a mankind that was different from us in size, and they were 10 times larger than us. The first mankind lived in a island, and they constructed a highly-evolved society, and they made a miniature version of them, which is us, the current version of mankind. Eventually, the giant humans get extinct because of a gigantic tsunami after a collision of an astroid, and only the miniature version mankind survives because they were expelled from the island for being rebellious to the first mankind. Now, the second mankind are all over the Earth, and their world is rapidly developing and ruining the Earth at the same time. They even succeed in making a new mankind that is one tenth a size of them. At the same time, Earth is preparing for another sweep on mankind.