Sleeping together as a team, Saya Hokage and her newfound group of Sleepwalkers excel at hunting Suiju – being that possess people’s spirits in the land of sleep. Until an unexpected darkness appears… Will the girls be able defend humanity's sleep?

The lives of the Cultural Research Club members are turned upside-down when they suddenly and inexplicably start swapping bodies with each other. Boundaries are crossed, and dark secrets come to light that threaten to destroy their friendship.