Liliaris is a marquis’s daughter with the “loser” attribute of light magic. On her way to her husband’s ducal territory, the carriage she was riding in falls off a cliff, and in a life-flashing-before-her-eyes moment, she remembers that in her previous life she was an otaku in Japan. Liliaris somehow survives, but when she awakens, she finds herself in the duke’s mansion—and she has already completed her marriage to a husband whose appearance she doesn’t even know!? On top of that, her husband proposes a “white marriage” of three years, after which they will divorce.

Determined to become independent after the divorce, Liliaris decides to raise the status of light magic and reform the ducal territory. While registering as an adventurer, she encounters Red, the guild master――!!