Onee-san

A pink-haired woman with green eyes stands against a blue sky and mountains, then turns and walks away with a man in a white shirt, followed by a scene of a man and a woman smiling together, then a woman in a purple top reaching for a door handle, then the same woman with red hair and glasses stepping through a doorway onto a mat, and finally a character with a large headband carrying another character on their back through a forest.