In the Great Pirate Era, the Grand Line is filled with countless ships vying for dominance. A man, reborn as the son of Big Mom, a rebellious member of the Charlotte family, who ate the Mythical Zoan-type Fire Dragon Fruit, possessing the ability to transform into a giant dragon and wield incinerating flames, begins his legend! "If you can kill me, then try! If I die here, it just means I'm not strong enough!"