Nagisa is a robot girl who is the new ruler of the music factory.Peoples call it as Sadistic Music Factory because Nagisa is very strict and fierce.She will never let her workers rest when the time haven't reach to Recess Time One day,she thinks out a way that can make the workers be active.She tells them that who can do the best can get her body for free.She uses her body as goal but still the target is 1000 songs a day.