The book "Tokugawa Masako" offers a comprehensive analysis of the life and significance of Tokugawa Masako, a prominent figure in Japanese history. Born on November 23, 1607, she was the daughter of Tokugawa Hidetada, the second shogun of the Edo period. Masako played a crucial role in the political and social landscape of Japan and was the mother of Imperial Princess Kazu-no-miya Okiko, who ascended the Chrysanthemum Throne as Empress Meish. The book not only illuminates Masako's life but also her influence on the imperial family and the succession of her sons, who became known as Emperor Go-Kōmyō and Emperor Go-Sai. Through a detailed examination of her role in history, it provides a deeper understanding of the dynamics of power and the status of women in Japanese society during the Edo period.