This house is located in Hibarigaoka, Nishitokyo City, where residential areas and fields coexist. Due to the site conditions, we decided to make the space three-dimensional and use it as a three-story building. The first floor is the space where the family is mainly, and from there, the stairs are used to set up a study corner shared by the family on the second floor. We are trying to create a sense of unity between the upper and lower floors through the atrium. On the second floor, the children’s room is adjacent to the study corner to give a flat sense of unity and make it feel wider. Take a spiral staircase from the 2nd floor to the 3rd floor. There is a storage space and a master bedroom that utilize the large attic space.