While Londoners regard dragons as fairy-tale myths, statistics verify that 72% of the city's fatalities are caused by these grotesque creatures. Because the public cannot see them, they remain unaware of their existence. However, in a mirror dimension to "Front London," there is a place where dragons are visible to the naked eye—"Reverse London." Ninny Spangcole is a member of a popular girl group. In Reverse London, she works as a "Witch" for Wing Bind, an organization that dispatches agents to exterminate the beasts and protect the citizens of both Londons using magic. Alongside her partner, Noel Niihashi, Ninny safeguards Balgo Ywain Parks, a young man with an odd connection to the dragons, in addition to their regular duties. Due to Wing Bind's efforts, there have been no fatal dragon attacks for nearly a century. But this peace is shattered when Balgo's presence unexpectedly triggers a Dark Dragon to wreak havoc in the city. The witches face further complications when Ninny's troublesome former bandmate appears in Reverse London, coinciding with the arrival of another powerful dragon.