Megumin and Yunyun are shocked to learn of the dark god Wolbach's appearance in the capital. But Megumin has a confession to make--she has broken Wolbach's seal before, and she knows for a fact that the deity couldn't possibly be there...But if that's the case, just who could this impostor be? With more questions than answers, there's only one way to find out--it's off to the capital for Kazuma and friends!