A legendary castle said to have been built overnight in 1566 by Kinoshita Tokichiro (later Toyotomi Hideyoshi) on the west bank of the Nagara River as a staging point for the Mino campaign. With the help of Hachisuka Koroku (Masakatsu) and the river boatmen, timber was floated downstream on rafts to complete the fort in record time. This feat won Nobunaga's recognition and became the turning point…

Traditionally dated to 1566 when Hideyoshi is said to have built it, though primary historical sources are scarce and later fabrication has been suggested. The story is detailed in military chronicles such as the 'Taiko-ki.' The castle was abandoned after the Tensho period. In 1988, Ogaki City built…