In the 64th year of the Meiji era (1931), the Tokugawa Shogunate continues to rule Japan with an iron fist, having never relinquished power to the Emperor and a democratic government. Under the reign of the immortal shogun Tokugawa Yoshinobu, who extended his life through forbidden onmyodo (sorcery), the nation is gripped by fear and oppression. The shogunate's secret police, the Yami-no-Kaze (Winds of Darkness), ruthlessly hunt down any whispers of dissent.