Hieihira House, completed in 1981 in Otsu, Shiga Prefecture, represents a significant example of residential modernism designed by architect Koji Kojima of Hexagon. Situated on the scenic Hieihira plateau, this residence exemplifies thoughtful integration with its natural surroundings. The design demonstrates Kojima's distinctive approach to domestic architecture, balancing contemporary construction methods with sensitivity to the landscape. The building showcases the minimalist aesthetic principles prevalent in Japanese architecture during the early 1980s. Its careful site planning and spatial organization reflect the architect's commitment to creating harmonious living environments that respect both functional requirements and environmental context.