Standing before you is the Emperor, who existed long before humanity's first city was ever built. The Emperor loves his human kin; throughout history, he has silently accumulated knowledge and protected his race. He has always looked out for humanity, helping civilization advance in different eras under various identities. After humanity's Golden Age, Dark Age, and the Age of Strife in the cosmos, mankind once again entered the Imperial Age. In the year 798 of the 30th millennium, humanity was once again united under a single banner: the joint ruler of Holy Terra and Mars, the guardian of the Imperium of Man, the Undying Immortal.

This is a powerful natural gas fruit that combines the abilities of the Explosion Fruit, the Flame Fruit, the Smoke Fruit, the Scythe Fruit, the Poison Fruit, and the Flash Fruit. It also has the abilities of flight, perception, and immunity to toxicity. It is a must-have for wilderness survival and extreme adventures.

The protagonist, Lan Moder, luckily ate the Gas Fruit and became a Gas Man. He set out from the East China Sea on an adventure to form a pirate group with the devil's son Nico Robin, following the path of the past Pirate King Gol D. Roger to unlock the secrets of the historical text.