故事講述一個在江戶時代叫做「湧太」的漁民，在年輕時吃了人魚肉後而變成不老不死。之後經過了很長一段時間，湧太開始對不老不死所帶來的孤寂感到痛苦，遂踏上旅程尋找人魚，從而尋求變回普通人的方法。500年後，他遇見被人魚族囚禁的少女「真魚」，得悉她也曾食用人魚肉，並將她救出，從此二人結伴同行。旅途中，他們遇到不少和人魚有關的事件，這些事件多數是人類因追求人魚所蘊含的不死力量而造成的悲劇......
故事講述一個在江戶時代叫做「湧太」的漁民，在年輕時吃了人魚肉後而變成不老不死。之後經過了很長一段時間，湧太開始對不老不死所帶來的孤寂感到痛苦，遂踏上旅程尋找人魚，從而尋求變回普通人的方法。500年後，他遇見被人魚族囚禁的少女「真魚」，得悉她也曾食用人魚肉，並將她救出，從此二人結伴同行。旅途中，他們遇到不少和人魚有關的事件，這些事件多數是人類因追求人魚所蘊含的不死力量而造成的悲劇......
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Amamiya is kawaii!
完結散花～～好看！