In the future city "Aethelburg" where memories can be extracted, stored and repaired, Lin Mo, a top memory restorer, lives a peaceful life repairing the broken past for others. He is calm and restrained, but he is completely blank about his past. During a routine repair, he accidentally discovered a memory fragment that belonged to no one - a girl wearing a silver butterfly hairpin under a sea of purple flowers. This "ghost memory" is like a key, opening up his dusty past and the huge lies covered up in this city. In order to pursue the truth, Lin Mo embarks on a dangerous journey. He will fight against a huge organization that manipulates memory, and while recovering himself, he will decide the fate of countless people.
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