Kōzōsu

[1] The exact commencement of her service to Nene (Kodai-in) remains uncertain, but by the time Toyotomi Hideyoshi ascended to the position of Kanpaku (Imperial Regent), she had assumed responsibility for managing the inner affairs of the court.

In 1590, during the 18th year of the Tenshō era, she sent a formal inquiry letter to Date Masamune, who was suspected of rebellion, on behalf of Hideyoshi.

Her role in delivering tribute items to the Imperial Court further underscored her prominent status among the lady-in-waiting staff of Nene.

Following Hideyoshi's death in 1598, Kōzōsu, along with Nene, left Osaka Castle in 1599 and relocated to Sanbonmoku, near modern-day Gion in Kyoto.

However, in 1614, just before the Siege of Osaka, Kosozu went to Suruga Province (present-day Shizuoka) and later received a residence in Edo Castle's vicinity from Tokugawa Hidetada.

Several hypotheses have been proposed: These conflicting theories continue to fuel the enduring mystery surrounding Kosozu's move to Edo.

A black-sealed letter of Kodai-in , written by Kōzōsu, to Arima Noriyori, the Lord Mita of Settsu, acknowledging the reimbursement of the money she had been loaning to the lord.