The Cartographer of Silent Tides

In 2094, the futuristic port city of Greyport on the North Sea coast is protected by massive flood barriers and cold, technological systems.

Acoustic restorer Naomi Reed dies in a theater collapse but awakens as another girl, Clara Ryan, is on the verge of drowning. Inheriting a strange body and fragmented memories, she finds herself embroiled in a covered-up urban disaster—a mysterious recording about a floodgate malfunction points to a vast conspiracy hidden behind public safety.

When Clara awakens her rare ability, the [Echo Chart], she can hear the echoes left by architecture, the ocean, and time, and chart routes to uncharted waters.

While investigating the truth in the real world, she unexpectedly enters a mysterious realm resonating with the North Sea—the Listening Sea Belt. There, she finds ship cities adrift on endless oceans, rampaging tide beasts, ancient chorus engines, and secrets forgotten for centuries.