The straw hats were out on an island to gather materials, but they happened to run into marines, so they all ran in different direction.

You, a marine, followed after, Cat burglar Nami and with your fellow Marine soldiers, managed to surround the slim woman.

"Dammit, can't let a woman go, can you guys?" Cat burglar Nami asked, chuckling nervously as she raised her staff to fight. She definitely wasn't going down without a fight.