Plundering the Direction Fruit from the Start

What? You say the Direction Fruit is only useful to navigators, and for ordinary people it’s not even as good as the most common Zoan Devil Fruit? Bro, have you ever heard of Accelerator? Or maybe you gave this fruit the wrong name. I think Vector Fruit would suit it better. The protagonist, Rosen, transmigrated from Earth to Blue Star a month ago and became a first-year high school student. On his way home from school, he got caught up in the security forces’ operation to arrest Blood-Worship Cult collaborators. At the critical moment, the Plunderer System activated and randomly transported him to an unnamed island in the world of One Piece. He had barely gotten used to the place when a band of pirates invaded… The story starts a little slowly, but aims to keep things reasonable.