For months, Aiko has been haunted by shadowy figures whispering her name, dreams so vivid they blur the line between sleep and reality. She thought nightmares were the worst of her problems, until she summons the mythical Baku, a creature said to devour nightmares. Baku's help comes at a cost. Can Aiko afford it?

As Aiko's past unravels, she uncovers her family's dark pact with the Baku and a horrifying truth. Can she sever the threads binding her family to this creature, or is she destined to continue the cycle of sacrifice? When the dream world begins bleeding into reality, Aiko must make an impossible choice. How much is she willing to lose to save the people she loves?