According to an ancient legend, a mermaid’s flesh grants immortality when eaten. Five centuries ago, Yuta inadvertently consumed a fragment of such flesh. For many years he wandered across Japan, hoping to find a mermaid who might restore him to mortal form. When he finally encounters one, he learns that she and her companions have been raising a girl to use as their food, thereby taking on the girl’s youthful appearance and staying young themselves. Yuta kills the mermaids and rescues the girl, though she has already ingested some of the mermaid’s flesh. Though he had to eliminate the mermaids, Yuta feels little disappointment. His solitary existence ends as he finds companionship in Mana. And Mana, who had been t...