In a broken near-future world, humanity faces a terrifying new incident: people who should be dead are attacking the living. The government turns to a specialized organization known as the Laboratory of Optics and Neural Analysis, or LONA, to investigate this phenomenon. The story follows researcher Ao and her apprentice Sango as they delve into the brains of the deceased, analyzing the neural circuits and memories engraved within them. Their work takes place within a sprawling synchrotron radiation research facility, where they seek to uncover what the dead saw in their final moments and what they left behind. By connecting with the lingering feelings and thoughts of the deceased, Ao and Sango aim to unravel the great mystery behind the attacks and confront the truth hidden in the deep depths of the human mind. The narrative unfolds as a neuroscience adventure, blending scientific inquiry with the emotional weight of the memories they encounter.