One Piece: I Ate a Fake Devil Fruit and Became Kaido's Twin

Mu Yun wakes up in the One Piece world with a terrible secret—he accidentally devoured a counterfeit Fish-Fish Fruit that transformed him into a black dragon identical to Kaido himself. When Sengoku slams down a newspaper demanding answers, Vegapunk plays innocent, Queen suspects an illegitimate heir, and Kaido stares at his doppelgänger in stunned silence. Two years later, the skies above Wano erupt as azure and obsidian dragons collide in a catastrophic showdown. Kaido's ultimatum echoes across the battlefield: "Submit to me, and I'll make you vice-captain!"