In 2018, a family hunting for a new home visits Kashiwanoha Smart City in Chiba Prefecture. They tour a model room in a tower apartment building with excellent facilities, set in a city built around the environment. Shortly after they leave, a violent tremor hits, and the tower they just toured rises up as a giant robot. While walking around town, the family also finds that some of the surrounding condominiums can turn into giant robots. What is going on in this place, and what secret does the city keep? The one-episode mecha short turns an ordinary house hunt into something far stranger.