Located in the densely populated areas in Tokyo. The site , an elongated square to the east and west , the frontage 7m, depth 20m, is located in the middle of a gentle plateau. Though the site frontage is narrow and locate the slope areas ,and also permitted only 4 floor by the legal constraints,we are asked to plan the 5 houses from client . While cramming the volume as much as possible in a narrow site of the dense residential areas,maximizing floor area , with consideration to the line of sight interference and ventilation , brithtness of dwelling environment,it becomes a theme how we secure the connection with the environment. Rather than draw a clear boundary line between the dwelling and nature ,or city and the architecture,by using a vertical domain that considers the moderate distance between environment and architecture,we hope the place settled as where the dwellings,nature and the city are mixed and well harmonized.