In a time where men with authority and fame are the downfall of woman's authority in the society , and the reason why women chooses the same gender to marry and avoid conflict from the abuse of men,Fate Testarossa is singularly unlucky ….. forced to choose between her soul mate and her salvation.

After years abroad, Fate has returned to Fulmine Castle to find her mother dying and the family treasury depleting. Then the old duchess wrests a final promise from her guilt ridden daughter: That Fate will marry heiress Yagami Hayate and restore the estate to its former glory. However, it is not her fiancée who quickens Fate's pulse. But rather her beautiful cousin Takamachi Nanoha.

Penniless Nanoha knows that nothing can come of their undeniable attraction, but there is a way she can help Fate. Enlisting some questionable characters from her past, Nanoha concocts an elaborate ruse to recover some of the Fulmine fortune from a notorious confidence artist. As the dangerous scheme unfolds, Nanoha and Fate are thrown together in pursuit of the very thing -money-that keeps them apart.