The first in Norio Nanjo's "Secret" series. The phantom Sanzo (Hiroki Matsukata) and Yume no Gosuke (Ashiya Gannosuke) are ordered to infiltrated the Echigo Nagaoka Domain.

In the era of the ninth shogun, Ieshige, the Ooku of Edo Castle was a world of only women, with Tokiwa at the head and numbering up to a thousand. The town girl Otoshi catches the eye of Oitsu-no-kata and is brought into the Ooku. Oitsu receives the favor of Ieshige and is blessed with an heir, but Oko-no-kata resents Oitsu to the point of wanting to curse her to death. At that time, rumors of an evil spirit in the unopened room spread throughout the Ooku.

The tragic, yet exciting story of the friendship between Nakayama Yasubei, a member of the 47 Ronin, and Tange Tenzen, a relative by marriage of the vile Lord Kira.