Uekusa Chiaki, an architectural modeler whose father is a famous architect, has a habit of traveling around and visiting nostalgic and cute buildings. He updates his SNS often and is quite popular. On the other hand, Haruno Fuji's boyfriend has recently split up with her. Feeling down, she begins exchanging messages on SNS with Chiaki. The two agree to meet up to have lunch at a famous Tokyo building. Adapted from the literary work "Aruite, Taberu Tokyo no Oishii Meikenchiku Sanpo" by Kai Minori.