However, there was Yogaisan-jo Castle (Sekisui-ji Temple) as the keep at the back of Tsutsujigasaki-yakata (Tsutsujigasaki Mansion), which was a typical Yamashiro (mountain castle) of busho (Japanese military commander) in the Sengoku period.
ただし、後背には詰めの城である要害山（積翠寺）城があり典型的な戦国武将の山城ともいえる。