In the City of Dusk where steam and neon intersect, watchmaker apprentice Link discovers that he can glimpse fragments of parallel time and space - he can foresee different consequences for every choice he makes. At first he thought it was an illusion, until text appeared in a wordless copper-covered notebook, guiding him to the city's ultimate secret: The City of Dusk Clock was not a natural product, but a fragment of time and space stitched together by the "Grand Tune" experiment two hundred years ago. The "Regulatory Council" composed of seven major families uses the living core "mainspring" to continuously suppress the diversion of time and space and convert the residents' possibilities into urban energy. Link's ability is the "loophole" that has not been repaired in the system. He formed an alliance with the aristocratic girl Irene who was accidentally involved, sneaked into the underground of the gear tower, and faced the core "core" as a prisoner and the old Morrison, who was his mentor and was actually the "repairer" of the parliament. When the "Depth Calibration" is about to start, Link must make an "impossible choice" that can shake the entire sutured reality, and the ancient bronze bell that was drowned to death is wailing in the depths of the ruins.
