Hoshino Yumemi takes up a new job as a presenter at the planetarium inside the Hanabishi Department Store. Instead of staying at her post, she repeatedly wanders out of the building hoping to draw in new visitors, much to the annoyance of her co-workers. The single-episode OVA is a prequel, adapting a short story that first appeared in a novel packaged with a special edition release of the first PC game. It mixes drama, fantasy, romance and science fiction.