One Piece: Song of Despair

A Devil Fruit, martial arts earned through blood and sweat, and Haki gained through obsession and madness. Sickly, cold-blooded, ruthless, and obsessive are his trademarks. From beginning to end, he has only one goal: anyone who crosses his line, even the world itself, will be destroyed completely, leaving no one behind. In reality, this is just the story of an ordinary boy.