This house is a minimum house for young couples built along the riverside of Ochiaigawa of Higashikurume, Tokyo prefecture, in Japan. It is built in the environment that is full of the green that was adjacent in Ochiaigawa, and it's white and simple volume like a "TOFU" individualizes surrounding environment. We designed interior so that nobody could feel and see their daily life extremely. Outer shell has minimum function such as only an insulation and the lighting, and it is abstract expression of a weak, white and thin outline. Contrary to it, We put almost daily life function into the core which constitutes a nest. Furthermore, We paint the core in deep-green and assume it contrastive expression with outer shell. The core divides the space of one room gently and it serves as an important infrastructure of the life. From the room such as an abstract picture, scenery of Ochiaigawa totally gets through a big picture window. It also seems to be one representational painting cut on a frame. We examined materials closely and made space without waste for the demand(low-cost) of the client. Besides, We performed interior paint in the self-build by the workshop of the client, architects and the students.