The year is 1931, the 64th year of the Meiji era. The 15th Shogun, Yoshinobu Tokugawa, continues to wield absolute power thanks to complete monopolization of a special natural resource known as "Ryumyaku." Supporting the Tokugawa regime from the shadows are the deadly agents of the covert organization known as Nue.

With confidential Nue files having been leaked to their enemies at Kuchinawa, a search is underway for the traitor who provided the information.

Now that her revenge is complete, Sawa doesn't know what to do with herself. With Tsukishima on the run and Elena facing a major change, what will become of the agents of Nue now that their primary target has been dealt with?

Sawa's brief respite from the cycle of violence has been irreversibly shattered. But even if she defeats the monster who brought an end to her dream, will she have anything left afterwards?