In a twisted reality where memory becomes currency, Ayida Lamour discovers an otherworldly black conch on the mysterious Isle of Saint Grax. The conch, a prison for the star-being Akelo, offers cosmic knowledge in exchange for memories. As Ayida investigates, she uncovers a biotech church led by Reverend Cyrus Blackmoor, who harvests memories to fuel a transcendence ritual.
The island exists in a time anomaly, where nights stretch beyond natural limits. The Hollow Choir, an unseen entity, broadcasts psychic frequencies that slowly transform islanders. Ayida must navigate between preserving her identity and stopping Blackmoor's plans, while dealing with the haunting choice of losing her only memories of her mother.