Inuzuka Momoka is beautiful and smart, respected and admired as one of her school's idols. However she one day finds herself transported to another world where a Hero works to stop powerful forces from a demonic realm. Even more shocking she's now become one of the Hero's traveling companions, a knight by the name of Mercia. Driven by cold, calculated ambition she strives to use her cunning to make the best of things in this new world as she aims to win the Hero's affection in order to realize her own goals.