After a Decade of Lying Low, How Did I Become a Navy Admiral?

In an era of extreme evil, the Four Emperors stand in opposition, Supernovas run rampant, the Navy Government, the Seven Warlords of the Sea...Inheriting the name 'Louis Klein' of this life, he only wants to survive as a navy officer.You executed a fish-man pirate, obtained a fish-man inner core!You executed a pirate swordsman, obtained a swordsmanship visualization diagram!You executed an extremely evil criminal, obtained the Killing Intent Wave!Swordsmanship visualization diagram, meditation, perfect Armament Haki, Observation Haki that foresees the future, Killing Intent Wave, forging a body that is enough to rival the aura of the strongest Conqueror's Haki...Without relying on Devil Fruits, without relying on any relationships, become the strongest executioner, the strongest Navy Admiral.Klein: I owe everything I have today to my own efforts!!!