What kind of letter is this?

A young woman with dark hair and goggles on her head holds a white cat, smiling at the camera on a sunlit city street, then a second woman joins her, and the scene shifts to show the first woman in a wide-brimmed hat with a cat on her head, followed by a third woman with glasses, and finally a group of four women, including the first, raising their hands in unison as a large, light-colored creature with long appendages looms in the background.