Mermaid Saga

(from ebookjapan): Main characters Yuta (formerly a fisherman who has lived for 500 years immortalized by eating the flesh of mermaids), and Mana, a girl raised in the mysterious village of women. A man dressed in dirty clothes walks along the seaside in midsummer, which is full of young people, with a map in his hand. The man, Yuta's destination is Nosurizaki. It is an unexplored region surrounded by steep mountains and rocky coastline. Yuta had been on a long journey to find mermaids in order to have his body restored to its former state of immortality after eating mermaid flesh 500 years earlier. When Yuta went into the mountains, he found a village where only women lived in seclusion. For some reason, the women had put a girl named Maio in shackles and were raising her in capti...