Character: Yuuta

The main character of the series, he is a 500 year old immortal. He ate the flesh of a mermaid out of curiosity when his fellow fishermen had captured one, but out of all the fishermen who ate a piece, only Yuta survived. His comrades had either been poisoned or turned into Lost Souls. Yuta was afraid that he would meet the same fate, after nothing happens to him, forgets about ever eating the mermaid's flesh. He takes a wife and lives normally until he discovers that while she grew older as the years went by, he had not aged physically since the day he ate the flesh. He hears that a mermaid will be able to help him turn normal again, so he begins his endless travel in search of a way to become mortal. Along his travels, he meets a girl named Mana, another immortal. He rescues Mana from mermaids who were planning to devour her, and she joins him as a travelling companion. Kind-hearted and helpful, Yuta has befriended many people who are affiliated with the mermaid's flesh over 500 years, and tried to help them from its curse.