One Piece: I Was Too Lazy, So I Became Fleet Admiral

With a bounty of four billion, he rivals the Four Emperors. Yet his identity is shrouded in mystery. As it turns out, he has been laying low among the Marines.

With the Lazy System, he slacks off every day and somehow ends up becoming Fleet Admiral.

When his killing of the Celestial Dragons is exposed, Will leads the Marines in overthrowing the World Government!