One Piece: The Demon God of the Marines

Pirates see him as a demon, while the Marines revere him as a god.

He draws his sword only to right wrongs.

In the name of the demons, he subdues the Supernovas, sweeps away the Shichibukai, and brings the Four Emperors to heel! He personally brings the Great Pirate Era to an end and ushers in the dawn of a new age.

“The devil punishes sinners for their evil deeds. I’m only responsible for sending them to hell.”

P.S. Please overlook the slightly chuuni writing style of the first twenty chapters. If you feel the protagonist is being put through too much, I recommend reading further. Thanks.