Kaikigusa-an is a residential dwelling completed in 1976, designed by Biiken Sekkei Jimusho and located in Koyoen, Nishinomiya, Hyogo Prefecture. This residence exemplifies the architectural practice of the 1970s, a pivotal period in Japanese residential design. The building's name, meaning "return to simplicity," reflects its philosophical approach to living spaces. Situated in an established residential area, Kaikigusa-an represents the designers' commitment to harmonizing contemporary architectural principles with the natural landscape and existing community character of the region.