She was a daughter of Narita Ujinaga [ja] and granddaughter of Akai Teruko, retainers of the Later Hōjō clan in the Kantō region.

She is known as the heroic woman who helped her father's resistance at Oshi Castle against Toyotomi Hideyoshi's army during the siege of Odawara.

According to the chronicle of Narita clan, she was praised as "The most beautiful woman in east Japan".（東国無双の美人）[2] In June 1590, Ishida Mitsunari led a 20,000-man army to take Oshi Castle.

Her accomplishments gave a huge boost to Narita army morale and forced Mitsunari to retreat, reporting his failure to Hideyoshi.

It subsequently affected his ability to gain the loyalty and support of Japan's other powerful daimyo after the death of Toyotomi Hideyoshi.

The Oshi castle was defended with a small number of soldiers and peasants, only fell when Hojo Ujimasa was defeated in Odawara.