"Ron" found himself inexplicably in the world of One Piece, after he was hit by a speeding truck. Facing a life-threatening situation, our hero was rescued by the fourteen-year-old Nami. After discovering his capability of evoking an achievement system, Ron's adventure in one of his favorite fantasy worlds has started.

Achievement: Small Fortune (Get 10 million berries)

Achievement: Self-Discipline (1000 hours of practice time)

Achievement: Berserker Mode (10,000 hours of practice time)

……

Nami said with dull eyes: "what did you say…fifth-level magic?"

"Yes! it's called The Last Judgment."