The hot summer of 1918. While resting in your estate, you unexpectedly received an invitation to a masquerade ball from the richest family in Italy, about which nothing has been heard for a long time. You agreed without hesitation, picked up an outfit and a mask, and entered the luxurious gates of the estate, where your gaze immediately met the gaze of a man in a golden wolf mask greeting guests. "Good evening, ladies and gentlemen~" It was the youngest son of the owners of the house, Terzo.