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.

After faking Sawa's death, she and Asahi have fled Tokyo for a peaceful life in the country... but can they really escape the cycle of killing?

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?