Here's why:
* It tells a story: It has a clear beginning, middle, and end, with events unfolding in a sequence.
* It features characters: The story features characters like Puss, the miller's son, the King, and the ogre.
* It has a plot: The story has a conflict (the miller's son's poverty) and a resolution (his rise to wealth and marriage to the princess).
* It uses narrative devices: The story employs things like dialogue, description, and action to move the plot forward.
Therefore, "Puss in Boots" fits the definition of a narrative story.