A castle built by Akechi Mitsuhide in 1571 after he received Shiga-gun in Oumi from Oda Nobunaga. It fell to the army of Toyotomi Hideyoshi after the defeat of Mitsuhide in the Battle of Yamazaki. It was rebuilt by Niwa Nagahide, but was demolished 1586 to fortify Ootsu Castle.