taking my Dark Knight Girlfriend to the corner store

Dana is a mostly normal girl living a mostly normal life until one day, Brunhilde- a fearsome Dark Knight from another realm- tears through a portal in the sky and asks Dana to guide her to find and slay the mysterious Gray Wizard. Instantly, Dana enlists herself as Brunhilde's companion and guide, promising to help her find her prize in this unfamiliar world - all while praying Brunhilde never catches onto the fact that Dana has no idea who she's looking for.