An ancient Japanese legend says that if one were to partake of the flesh of a mermaid, one would be granted eternal life and youth. Yuta ate the mermaid's flesh 500 years ago and became immortal. Since then he has had to deal with living a lonely never-ending life, watching his loved ones grow old and die. He spends centuries searching for a mermaid and wishing he had a normal life like others. He believes that the Mermaid will be able to tell him how to become mortal again. When he arrives at a village, he meets a girl named Mana, who also became immortal by eating a mermaid's flesh. Together, they start their journey in attempting to find a mermaid and regain their humanity.
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