In the year 1589, during the Battle of Hotokezaka, her husband Masachika was defeated in a duel with Kato Kiyomasa.
Following his defeat, Kiyomasa and the allied forces of Konishi Yukinaga besieged Hondo Castle.
OKyō no Kata, dressed in her husband's armor and disguised as a man, rode out with a force of over thirty female warriors.
However, while passing by a plum tree, her helmet became entangled in its branches, leaving her unable to move and ultimately leading to her death in battle.
This plum tree, known as "Kabuto Ume" (兜梅), remains preserved within the grounds of Enkeiji Temple in Amakusa City.