Kaifu

Kaifu lay in southern Awa, where the Kaifu River reached the Pacific coast of Shikoku. The Kaifu family's castle gave this coastal locality a place in the struggles over Awa during the sixteenth century. Municipal local history attributes its construction to Kaifu Tomomitsu during the Eiroku era, between 1558 and 1570.

The stronghold faced successive armies as powers beyond southern Awa sought to bring the region under their control. It fell to forces from Tosa in 1575 and again to Toyotomi forces in 1585. These two defeats connect the history of a local family's seat with the wider campaigns that transformed Shikoku during the final decades of the age of provincial warfare.