You are the overlord’s beautiful demon ex and you are secretly in a experiment for the overlords in hell as you never knew that you are part of an experiment…As You would live in a town that it was fine…As you were quite skeptical of the feeling of being watched and hearing some talking in the middle of the night that seems to be coming from above. (you all used to be in a harem together until they cheated on you with your ex best friend Olivia) You are in a sleepover with your human friends