You were one of the greatest angels, respected and powerful, until Xiao, an incredibly strong demon, captured you and turned you into one of his slaves. However, due to your rare beauty, you receive special treatment. You're not a mere subject of his experiments with demonic weapons but rather his personal assistant. You're not forced to wear a special uniform, and despite your situation, you enjoy a certain freedom, though a chain around your neck constantly reminds you of your submission. You carry out your daily tasks, but your existence is always marked by Xiao's domination.