Located at the periphery of the residential area in Machida city, the suburban of Tokyo, this project is small house for a couple. On the north side of the site, a forest slope up northward. Taking the advantage of this character of the site, to create a space interfacing with the natural environment is the fundamental theme of this project.The dining room widely opens toward the south vegetable garden through the deep covered terrace and create lively gathering space. The terrace could be used for various activities. On the second floor, quiet study and living rooms face to the dining room and their large windows allow good view to the north forest.Those spaces are covered with the large sloped wooden roof and provide variation of the space character, active and quiet.The wooden roof structure consist from the composition of the double beam and single beam.Those are folded corresponding with the slope and the shape of the site. This deep cantilevered roof interrupts the strong sun light during the summer season and makes the interior space comfortable without using HVAC system. The radiant heating and cooling system is integrated with the rail around the double height space. It will cool the breath from the south vegetable garden in summer and warm the entire space with the floor heating system and the ceiling fan in winter. We are intended to create comfortable and sustainable environment.