Mokkami-yama House 6, completed in 1980 in Nishinomiya, Hyogo Prefecture, represents a notable residential project by architect Isao Ishii of Bi-ken Design Office. This house exemplifies the architectural philosophy of the early 1980s Japanese residential design. Situated in a hillside location, the residence demonstrates thoughtful integration with its natural surroundings. The design reflects the modernist principles that characterized Ishii's work during this period, featuring clean lines and functional spatial organization. The house remains an important example of residential architecture from this era in the Kansai region.