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Even though he should be able to die like a normal human, Kiyonosuke has been living for thousands o...
Mermaid X Human
Damn... This was Sad yet beautiful. It's such a good story. Made me cry.
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.