Konosuba God Blessing Wonderful World (Manga) Vol 16

Megumin and Yunyun are shocked to learn of the evil goddess Wolbach's appearance in the capital. But Megumin has a confession to make-she's already broken Wolbach's seal before, and according to her, the real Wolbach couldn't possibly be in the capital...so where is she? Yen Press
(A) Natsume Akatsuki, Masahito Watari