One year ago, Aika Fuwa and her parents were murdered under mysterious circumstances. Swearing vengeance on her killers, Aika's older brother, Mahiro, sets out to determine who ended her life prematurely. Unbeknownst to Mahiro, his childhood friend and Aika's secret longtime boyfriend, Yoshino Takigawa, ends up getting dragged into the investigation after being held at gunpoint by a strange woman. Yoshino learns that Mahiro is being investigated by the government after outbreaks of a mysterious "iron sickness" in two locations where he was previously seen. Now on the run, Mahiro and Yoshino's search for Aika's killers becomes harder and more dangerous. In an effort to find a lead on his sister's murder, Mahiro strikes a deal with Hakaze Kusaribe, the most powerful sorceress in the world w