Igawa Asagi, a veteran shinobi, had finally embraced a quieter life after vanquishing her greatest rival years before. That fragile peace shatters when her enemy returns from death, empowered by a pact with the city’s ruling demon and determined to strike at everyone she holds dear. Her sister, also a skilled shinobi, and her boyfriend are soon drawn into the web of retaliation. In this opening episode, Asagi must confront the renewed danger closing in on her loved ones.