We designed and concept design the entire house, from design administration concept design the interior design and exterior concept design. The site overlooks the Sea of Japan, and the area is known as a scenic spot with a dynamic topography called "cave". On the other hand, if you look at the surrounding area, you will see that the labyrinth-like intricate alleys create a unique streetscape. This is a feature unique to this area, with a square-shaped structure with cranked intersections to prevent the north wind from blowing through. By incorporating this unique alley structure into the ground floor plan, the architectural volume is segmented and harmonizes with the surrounding environment. The exterior and entrance hall are structured like a topography based on the motif of the ria coast, and the continuity with the streetscape is ensured by setting back from the south side. On the other hand, the north façade is raised one step higher than the surrounding area, and has a three-dimensional square-shaped structure intended to prevent the north wind from blowing through to the city. For the exterior finish, in order to echo the external characteristics of the ria coastline, with its rocky surface at the bottom and lush trees at the top, we used rock-like concrete with exposed aggregates for the lower layer, and wood-grain concrete with cedar board formwork for the upper layer. Both the aggregates that appear on the surface and the cedar board formwork materials are made from materials that can be collected in the area, and we hope that the unique expressions of the materials will weave the unique scenery of the location into the future. In addition, by applying this two-tiered structure to the finishes of the interior spaces as well, it creates a sense of unity with the architecture, contributing to fostering a sense of unity between the inside and outside.