Wadatsumi no Yometori
Complete | Monzen yayohi | 2019 released
Insta Even though he should be able to die like a normal human, Kiyonosuke has been living for thousands of years, all because he accidentally "married" a merman. But Kiyonosuke can't give up on his humanity and has been looking for a cure to immortality.
Mermaid and the Magician