Chapter 1138 of One Piece stunned fans with the appearance of the ancient Harley book and the mural on the Adam tree. More than just a timeline, this relic reveals a shocking truth. The world we know is actually the “third world,” born after cycles of destruction filled with blood and tears.
The First World: An Advanced Technological Era Before the Void Century

According to the mural in the Harley book, in the earliest days, Earth held a fierce fire deep underground. People of that era learned to “harvest” this fire as an energy source to build towering skyscrapers. Remarkably, this architecture looks more modern and familiar to our current world than the Ancient Kingdom.
This rapid development bred greed, spreading slavery worldwide. Amid the slaves’ cries, the first Sun God appeared, clashing with the Earth God and the Hellfire Serpent. This epic battle destroyed the first world completely. Notably, the mural also depicts objects resembling Maxim ships and the Moon, sparking theories that the original Sun God was actually a Moon inhabitant who came to the blue planet.
The Second World: The Dance of the “Devils” and Joy Boy’s Death

After the old world fell, the second world (the Void Century era) emerged. At this time, the Forest God unleashed his devils, an ancient tree on the mural hints this is the origin of Devil Fruits.
Harley explains the need to distinguish between the “Sun” (raw energy) and the “Sun God” (the savior deity). In the second world, the Sun God was Joy Boy. The mural shows humans killing the Sun and crowning themselves as gods. This symbolizes the alliance of 20 kingdoms murdering Joy Boy, overthrowing the Ancient Kingdom, and rising as the Celestial Dragons (Tenryuubito) we know today.
After his death, the Sea God (Poseidon at that time) grew furious and vanished, never to see Joy Boy again.
The Third World: Luffy’s Era and the Battle to End Darkness

The third world is the current age of Luffy and the Straw Hats. The mural notes “something lost amid chaos,” referring to the Hito Hito no Mi, Model: Nika fruit, which escaped the World Government for 800 years thanks to its own will. The “darkness of suffering” represents the brutal rule of Imu-sama.
A mysterious line in the Harley book says, “After hearing the Moon split in two…” Hardcore fans believe this connects to Enel, the god who rules the Moon and is poised to return.
As the mystery unfolds, the new Sun God, Luffy, will laugh, dance, and charge into the final battle against darkness to end the cycle of destruction. The mural shows Luffy not alone but alongside a massive alliance, facing the reborn “Sun,” likely the tyrant Imu wielding the ancient fire energy.