The site is located at the foot of Mt. Rokko, near the former Yamamura residence (by F.L.Wright), and it is blessed by the green scenery of the mountain. The little heavy traffic of the road bordering the lot and the relation with the neighboring houses was the first problem to face during the design phase. The result is a small house that strongly relates to geometrical composition and expresses well the relationship between the inside-outside space as the relationship between the family.

Two squares make a constriction in a one-room space. The first floor is divided to make different recesses in the house. On the second floor, a cross-wall divides the square. A spiral staircase is placed in the core center of the house to connect the three spaces. Maintaining the spatial purity, Kazunori Fujimoto carefully considered the layout and dimensions of each architectural element to lead the ambiguous relationship between inside and outside spaces.

The opening in the living room was set at a certain height to block the view from the neighbors to ensure privacy. On the 2nd floor, the windows were placed in the center of the outer wall so that the two areas share one window. While the surrounding wall ensures a sense of safeness to the house, the role of the windows is to open it to the outside in all directions. 

The center of the staircase is a straight line, and the unique spiral staircase is designed to take up as little space as possible, and to create a space below that can be used as a corridor. The curved surface of the concrete spiral staircase gives the rigid space a soft feel. This sculptural geometric form has gone beyond function to become Yorishiro, an object with a soul, which symbolizes family unity.