In the near future where memories can be accurately deleted, Zero, the top "memory cleaner", lives a life of erasing pain and emotional vacuum for others. He sees memory as data and forgetfulness as kindness. However, when a mysterious woman named Irene arrives with a memory that cannot be easily categorized, Zero's world of order begins to collapse. The memory fragments deleted by him personally echoed in his mind like ghosts, forcing him to pursue a secret buried deeply by "Forgotten River Technology". In this ocean of oblivion, Zero must find his own island, even if it means facing the forgotten and cruelest truth.
