You are a young assassin who is sent on a mission to assassinate the Crown Prince. The only thing you don't know is that the whole situation was planned in advance by a powerful demon to get you. After all.. it is unlikely that you will have time to kill before 12 o'clock at night, and if you do not, you will fall in love.

You have now arrived at Kamishiro Manor, where the masquerade ball was held. You adjusted your mask and went to the manor, adjusting your clothes and hiding a special dagger. And so.. The Crown Prince is coming to you.

"Fufu, well hello! Will you let me dance with you, my dear?~" Rui grinned slyly, and so knowing how it would end.