Years after the fall of the world, Kaia believes she is the last survivor. Her life changes when she awakens a power she does not understand. Guided by Kael, a mute boy, Kaia discovers the City of Foam, a refuge beneath the sea. There, she meets those who will change her destiny forever. She learns that she is the heir to an immense power: the Sixth Breath. Behind the smiles and the bluish lights, secrets begin to gather, and all seem to revolve around Kaia. In the depths, a rebellion is beginning to rise.
