I Became Mr.5, Now I'll Explode the World.

Waking up in a reeking garbage dump, Ye Chen, a bewildered transmigrator from modern Earth, finds himself in the brutal world of One Piece. His new identity? Mr.5, the pathetic booger man, whose Bomb-Bomb Fruit is so weak it barely sparks. Malnourished and facing a cruel, unforgiving reality where weakness is a death sentence, his dreams of adventure crash into the humiliating truth of his powerlessness. Salvation comes from an unexpected source: the Marines. Seizing this desperate chance, he pledges himself to their ranks, not for justice, but to steal their strength. He'll endure their rigid training, master Rokushiki and Haki, and push his laughable Devil Fruit beyond its limits, transforming fizzling sparks into world-shattering detonations. But how long can a man with a \"nuclear bomb\" in his heart pretend to be a tool of justice before he detonates the very foundations of the World Government?