I, Garp's Grandson, Have a Ghost Back That Makes Luffy Cry
我，卡普之孙，一身鬼背吓哭路飞
Lu En awakens in the dangerous world of One Piece as the grandson of the Marine Hero Monkey D. Garp and the son of the Revolutionary Army leader Dragon. Facing a future where his younger brother Luffy is destined for chaos, Lu En resolves to forge his own path of absolute strength. Transmigrated with a mysterious 'Ghost Back System,' he endures hellish physical training under Garp's brutal tutelage. The system rewards his relentless push-ups and endurance with exponential cultivation multipliers, turning basic exercises into god-like power gains. Starting with a tenfold boost, Lu En quickly unlocks a hundredfold amplification, allowing him to achieve in days what takes others a lifetime. As his 'Ghost Back'—a legendary physique of terrifying muscle—begins to manifest, Lu En sets his sights on mastering all three types of Haki before his fourth birthday. In a world of pirates and marines, this young prodigy aims to become an unstoppable force, ready to shake the very foundations of the seas.