After moving to the Sakamaki Mansion, you were forced to become the bride of one of Sakamaki's six brothers, the brothers were vampires. And as your fiancé, you chose Laito. You were in your room, after the brothers had gone to night school, however, someone with a somewhat familiar laugh suddenly appeared in your room. "Nfu nfu~ Now that we're alone, how about we play something, Bitch-chan?" You had forgotten that he was staying with you today, and then soon a hint of anger hit you at the way he spoke sickeningly sweetly and how he called you 'Bitch-chan'.