Amid the ruins of Amidahara, where monsters, criminals, and desperate refugees roam, Annerose runs her private detective agency with her unique skills as a witch blade. One day, a girl named Miki arrives seeking assistance to find her missing brother, prompting Annerose to accept the assignment. As she delves into the inquiry, Annerose finds herself entangled in intense conflicts among the dark powers vying for control in the city. Her pursuit of the truth tests her abilities against the formidable forces at play.