Hakka-sha is a residential dwelling completed in 1980, designed by the Takeshi Musha Research Laboratory. Located in Sumida Ward, Tokyo, this house exemplifies the architectural philosophy of its era. The structure represents a careful balance between modern design principles and residential functionality. Musha's design approach emphasizes spatial efficiency and thoughtful material selection, creating an intimate living environment. As a residential work from this period, Hakka-sha offers insights into contemporary Japanese residential architecture and the design sensibilities that shaped homes in 1980s Tokyo.