Hisamatsu PAO is a residential dwelling completed in 1999, located in Saiki District, Hiroshima Prefecture. Designed by the Kazuhiro Ishii Architectural Institute, this house exemplifies contemporary residential architecture from the late 20th century. The building reflects the architect's distinctive design philosophy, integrating thoughtful spatial planning with modern construction techniques. Situated in Hiroshima's suburban landscape, Hisamatsu PAO represents an important example of residential design that bridges traditional Japanese architectural principles with contemporary living requirements, making it a notable reference point for those studying modern Japanese domestic architecture.