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The protagonist Char has had a lifelong dream every birthday night since he was twelve years old. In the dream, after experiencing his whole life, he will wake up and continue to live in reality until the next birthday. In this dream, Char frequently meets a girl, but whenever the girl leaves, Char loses his memory of the girl. According to legend, finding the heart of the ocean hidden deep in the fantasy sea can solve the puzzle of the dream world. What is the truth waiting for Char...