A woman named Mio Momoi is a deeply indulgent figure who loses herself in masturbation fantasies. Her thoughts gradually become fixated on a mysterious, alluring masked woman who imprisons her within a blue room. Trembling at the realization that her body belongs to someone else, she spirals into a whirlpool of humiliation and desire, slowly losing herself. Throughout this process, her mind is profoundly shaken and drawn toward increasingly intense emotions.