When "Zero" woke up on an isolated island made of glassy black sand, he lost all his memory. On this strange island, the trees glow with metallic luster and the sky is always leaden gray. His only companion is the mysterious woman "Lan" who is full of hostility and confusion. They are trapped in a world that is both a prison and a puzzle, with the only clues being the broken shards of their minds and a rusted lighthouse. In order to find the answer to "Who am I?" They must work together to dive into the dark sea called "Forgotten" and salvage the buried truth. However, when the fragments of memory are pieced together, a cruel fact emerges - sometimes forgetting is a kind of mercy.
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