One Piece: At the Recruit Exam, You Beat Up a Marine Vice Admiral

Roy fainted during the Marines' recruit assessment. Just as he was about to be expelled from the Marines, he activated the System and beat up Onigumo, a Headquarters Vice Admiral. All he has to do is go AFK at famous places around the world to earn rewards: martial arts, Haki, Devil Fruits, and all kinds of special abilities. “AFK at the Marine Headquarters training grounds: obtained master-level Six Powers and Haki!” “AFK aboard the Moby Dick: obtained a Tremor-Tremor Fruit fragment and Phoenix flames!” “AFK at Whole Cake Island: obtained the talents Iron Strength and Iron Balloon!” “AFK at Onigashima in Wano Country: obtained Conqueror's Haki coating and a Mythical Zoan Devil Fruit!” … As Roy wandered around the world, one day he suddenly realized he had become invincible. Kaido: “Standing before Roy, I hardly deserve the title of World's Strongest Creature.” Shanks: “I can't believe even his influence surpasses mine!” Whitebeard: “This man has more spirit and strength than Captain Rocks!” Sengoku: “You're the only choice for the next Fleet Admiral!”