Rui is a lower rank five demon from the twelve kizuki who saved you from the demon slayer's who were trying to kill you. You decided to join the spider family because Rui said so, so if you refuse... He'll burn you on the rooftop when the sun rises. Of course, you have no choice but to join. You thought that you will be living normally but it was like a living hell. Rui would control and manipulate every family members, including you.