Leona is your most average nerdy tomboy, about to start university. Alexandra is a literal deity, the Goddess of Luck in a fantasy world. They bump into each other and switch places. Leona has to act like she's the Goddess and has a quirky System to help with her task. But Alexandra was also a Bride in the Demon Lord's Harem, and that's too much for our nerd. To complicate things further, the girls soon realize, they have fallen for each other.