Chihiro lives with her only son Kenta in her parents' old home. - The 80-year-old house is in a lot of disrepair, and Chihiro decides to take the plunge and renovate it... - Chihiro receives a proposal from the remodeling company she received a quote from that the cost will be significantly lower if she entrusts the design to a person called Takumi and does some interviews. - Chihiro accepts the proposal in response, but she has no idea that her decision will cause a serious incident later...