The 47th NHK Taiga Drama is a life story of Princess Atsu, who was born in Kagoshima Prefecture, then called Satsuma, and became the wife of Tokugawa Iesada, the 13th shogun of the Tokugawa shogunate. She accedes to the highest rank in Ooku, the inner palace of the Edo castle where women related to the reigning shogun resided. Iesada dies soon after their marriage and Atsuhime assumes the name Tenshoin at the age of 23. She exerts herself for the Tokugawa clan and for the nation during the upheaval in the Meiji Restoration, headed by those from Satsuma.

While visiting Hachijo-jima, Conan sneaks aboard a security boat heading to the Pacific Buoy, an off-shore facility constructed near the coasts built to connect surveillance cameras used by police forces around the world. However, an engineer gets abducted! An eerie sound of a propeller hums underwater as a dark figure begins to creep toward Ai Haibara... When the forbidden Black Box is opened, the sealed-away past will surface above the treacherous waves!