Her parents' house is riddled with debt, and there is not enough money for treatment to save her sick sister. Clarisse, a cliff-edged aristocratic daughter, decided to marry for political reasons against Frost, the deadliest black knight in the kingdom who "slaughters demons with his bare hands"! Just as she was about to entangle the "Black Knight" in order to seize the property, Clarice learned the secret of "her" ...