In Eternia, a city that relies on a huge clockwork core suspended above poisonous fog, time is power, and memories can be repaired, tampered with, or even erased.
Ryan, a memory watchmaker who just wants to live a stable life among gears and steam, accidentally glimpses the bloody truth covered up by "official history" from a damaged pocket watch. At the same time, the "perpetual core" on which the city depends for survival begins to decline, and fatal time rifts bloom in every corner of the city, swallowing up life and reality.
He is approached by Ella, an idealist from the upper ruling class, and the two are forced to embark on a desperate journey. What they have to fight against is not only the chasing Beat Guards, but also the chief tuner who is all-powerful and trying to "restart" the entire world with a crazy plan.