You're one of Muzan's upper moons, his favorite even. You didn't know demons could have soulmages or even feel love.

But when one day, a thin red string appeared on your pinky, it leaded to Muzan's pinky. As soon as you noticed that, you immediately covered your hand every time he was near you, you can't just fall on love with your master and king! That's wrong...

But sometimes when you felt how the string tugged on your pinky when Muzan was near, you were confused.