Stalker

A blonde cat-eared girl in a school uniform stands in a doorway, then the scene cuts to two girls on a lawn in a doggy paddle pose, with the blonde girl on the right and a brown-haired girl on the left; the blonde girl looks back over her shoulder with a surprised expression as the brown-haired girl looks forward, then the scene cuts back to the blonde girl peeking from behind a door frame with a neutral expression.