In the drowned ruins of Yokohama, twenty-one-year-old Koji survives on salvage, static, and stubbornness — until the night tall, cloaked figures rise from the bay and drag her brother beneath the waves.

To follow him, she must stop being human.

Remade in a dying laboratory — eight limbs, skin that betrays her every emotion in light — Koji descends into a deep that was never empty. Below the crushing dark lies Cyberlantis, a breathtaking city grown from living coral, where a vast machine intelligence schedules every heartbeat and calls it peace. Beyond it, a starving rebellion builds its home inside the bones of a dead god. And between them hangs a black pyramid that drones refuse to look at — patient, perfect, and waiting for her.

Both sides call her the anomaly: the one mind in the ocean no system can read. Both sides want her as their weapon. But the deeper Koji ventures, the more the war unravels — because the same ancient mark is carved on both sides of it, and the only being who never lies is the one she should fear most.

Some cities eat their gods. Some gods are still hungry.