A peculiar ailment plagues individuals with sporadic bouts of delusions, transporting them into their personalized fantasies. Despite being controllable with supervision, those affected require constant monitoring to ensure their safety and that of others. Nakanishi Kei crosses paths with a young woman afflicted by this daydreaming sickness, convinced that he embodies 'Pierrot the Ripper' upon their first encounter. As she entangles him in her fantastical dream world, her persistent desire to intertwine their realities persists long after the dream fades.