A man codenamed "Zero" wakes up on an isolated island made of broken memories, surrounded by an everything-devouring sea of oblivion. The island's only inhabitant, the mysterious woman Eva, advises him to accept the status quo, claiming that memories are the source of pain. But a lighthouse projecting fragmented images, a forest echoing the conversations of others, and a stopped pocket watch all tempt Zero to explore the truth. He gradually discovers that the island is not a sanctuary, but a carefully designed prison for his thoughts. In order to regain his "self", he must dive into the sea of oblivion and face the buried past that could completely destroy him.
