A man code-named "Zero" wakes up on an isolated island made of memory fragments, facing the rising black ocean called "Forgotten". A mysterious voice calling himself the "Pilot" becomes his only guide, guiding him to find scattered "memory anchors" and piece together his fragmented identity. Every time the memory reappears, it is accompanied by the tremor of the isolated island and the peeling off of the truth. He gradually discovers that he is not an innocent amnesiac, and the key to the mental prison that imprisons him may be hidden in the guilt he least wants to face. Escape means facing the past; forgetting means eternal sinking.
