Koigakubo thrived since ancient times as an inn post on the highway which links the Tōhoku and Hokuriku Regions to Kyoto and Kamakura. Sugatami-no-Ike pond was a place around here where a prostitute named Asazuma Dayū drowned herself overwhelmed by her sorrow when she heard the news that Hatakeyama Shigetada, a warlord who loved her dearly, had been killed in a battle. The pine tree of matchless beauty is a burial mound for Asazuma and Amida-dō hall is said to have been built for Shigetada who died in the war and there remained many historic spots related to Shigetada and Asazuma in Koigakubo.