The people of the Omega Empire suffer under the oppressive rule of Emperor Duke. Egregious violence—and possibly death—awaits anyone attempting to defy the crushingly heavy taxes…

The population at large live in fear of their Imperial overlords. However, a brave few have risen up to destroy the Empire—the resistance movement Ψ (Psi), headed by the renegade leader Edgar.

On the surface, they work as jacks-of-all-trades, helping citizens in need. Below the surface, the organization’s main activity is “purging”—that is to say, assassinating—Imperial officials and criminals alike. Anyone who brings suffering to the populace could be next.

One of the members of Ψ is a beautiful, dark-haired woman who hardly looks the part of an assassin. With her beloved sword Oborozuki in hand, which she received from Edgar, Hazuki is ready to face the empire once again.