Its a yaoi manga and it was about a human meeting a merman and the merman made him his wife I don't remember much but he was the last of his species? And at the end they both became immortal and lived till modern times
https://www.mangago.zone/read-manga/wadatsumi_no_yometori/ ?
Yess omg ilu
Its a yaoi manga and it was about a human meeting a merman and the merman made him his wife I don't remember much but he was the last of his species? And at the end they both became immortal and lived till modern times