In the future city "Xinhai" where memories can be extracted, traded and even erased, the top memory restorer "Zero" lives like a ghost. He has no past, and his only obsession is to repair the memories of others, trying to find his own reflection in them. When a mysterious woman named "Nightingale" comes for help with a memory core that has been torn apart by violence, Zero is drawn into a huge conspiracy that spans the light and darkness of the city. That broken memory is not only the key to unlocking Nightingale's past, but is also closely connected to Zero's erased identity. In the forgotten deep sea, they are each other's only island and their only hope.
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