One Piece: The Strongest Weapon

He arrives in the world of One Piece with the strongest weapon System, then accidentally blows up Marine Headquarters. The Ice-Ice Fruit is powerful? Try my cryogenic sprayer! The Magma-Magma Fruit is strong? Eat a blast from my focused flamethrower! The Glint-Glint Fruit is impressive? Well, where's my giant laser cannon?

Young man, what weapon do you want? Call me Dad, and I'll make you the Pirate King!

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.