Rem has been left in a sleep no one can wake her from, her name and her place in everyone's memory gone with it. Subaru Natsuki returns with Emilia to the manor of the margrave Roswaal, chasing any lead that might bring her back. Their search points to the Sanctuary, a hidden refuge created by the witch Echidna and tangled up with Emilia's own buried childhood, and getting there means facing whatever guards its secrets. Beatrice and the spirit Pack round out the household Subaru leans on as the mystery keeps circling back to people he still doesn't fully understand.