Mahiro Fuwa has left a month ago to find his family's killer without any clues to who it might be. When Yoshino is held at gun-point, Mahiro comes out of nowhere and swiftly saves him and can stop bullets in mid-air, claiming to have a deal with a sorceress; not just any, but the strongest sorceress, Hakaze Kusaribe, who promised to help find his family's killer with her magic so he can kill the killer himself. After saving Yoshino, Mahiro informs him about the epidemic, a curse that turns living things into metal, claiming Kusaribe clan plans to revive the Tree of Zetsuen that could destroy the world.